There’s a lot that can be conveyed in a handshake. Throughout history, such a(n) _______ was used to complete a business deal,_______ friendship, or signal trust.

But touching strangers can also lead to other, less beneficial shared_______ – like disease outbreaks. As fears about COVID-19 increase, France has warned its citizens to_______ handshakes. However, with histories dating back thousands of years, the greeting is likely too_______ established to be so easily stopped

A popular theory about the handshake’s_______ is that it began as a gesture of _________. Grasping hands proved you were not holding a weapon – and _________   them was a way to ensure your partner had nothing hiding up their sleeve.

There may be a_______ explanation for its lasting power. In a 2015 study, researchers in Israel filmed handshakes between hundreds of strangers and found nearly a quarter of participants________ their hands unconsciously afterwards.________, they concluded that a handshake may be used to detect chemical signals, and possibly as a means of________ – just as other animals do by smelling each other.

Behavioral scientist Val Curtis in London says that one possible________ for the handshake as greeting is to imply that the other person is __________   enough to share germs (细菌) with. Because of this, the________ can go in and out of style depending on public health concerns.

One cold Friday the bus was about to come in around 15 minutes. Most of the time I am OK waiting but not this day. So I went to the nearby store and bought something ________ to drink and then came back. A high school girl was there, waiting for the bus, too. She looked ________ and she was shivering（颤抖）because of the cold. I gave her one of the cocoa cans I bought and we had a little ________.

She said that she was quite nervous, being afraid that she would fail her exam in a week. I told her a few encouraging words ________ some funny jokes to make her relax. She seemed to be happy again. She thanked me and told me she wished to see me again. I ________ and thanked her, nodding yes. The bus arrived and I had to ________ in a hurry.

We may ________ see each other again. But I’m thankful to her for saying “Wish I could meet you again”. It’s not easy to say these words. It ________ a strong will and courage to accept an offer from a stranger. In today’s world, people are ________ with people they aren’t familiar with most of the time. What’s more, they seldom trust each other.

That young girl helped me more than I could have helped her. She touched my heart with a ________ to send wishes of good luck and love to those who are full of emotions and fears.

I remember sitting in an airport one day, waiting for my flight. 1 was______because I had a first-class(头等的)ticket. And in first class, the seats are______and the food is more delicious. Actually, I had the best seat on the whole plane! Seat 1A. Before boarding, I______a young lady who had a big suitcase(手提箱)and several carry-on bags was holding a crying baby. _______,the handle(把手)of her suitcase broke and the suitcase fell to the floor．She tried______the case and her bags landed on the floor, too.

“Let me help,”I said to her.

__ her suitcase over my left shoulder，put her bags on my right and asked, ‘‘Where to?”

“Gate 20, ”she said, and showed me her ticket. Seat 24B.

“Oh, we are on the same flight.’’

Boarding started, and I______that she needed the first—class ticket. ‘‘It looks like you could use this first-class ticket more than me. I know how______it can be flying with a kid. Why don’t we trade tickets?’’

“Are you sure'?”she asked.

“Yes, just take my ticket and give me yours. I really don’t______. I’m just going to be working the whole time, anyway.’’

“That’s very kind of you,”she said, and expressed her______as we traded our tickets.

Then we boarded the plane.I was surprised at the good______it gave me while watching her sit down in seat l A. In fact, seat 24B or______I was sitting didn’1 seem that bad at all. At one point during the flight I really wanted to see how she was doing. So I______, walked to the first—class section, and had a look. There she was with her baby, ______asleep. Seeing they were sleeping in big and______seat l A, I felt like a million bucks. I’ve got to keep doing this kind of thing.