用括号内动词的正确形式完成下面短文。

Good morning, and welcome to your tour of Bob and Betty’s Ice Cream Factory. Here you’ll learn a lot about how ice cream 【小题1】 (make)! Let’s begin.

In this room, cream will be taken out of our large refrigerators first. Then the cream 【小题2】 (put) into this machine. While the cream is mixing, sugar will be poured ( 倒 ) slowly into the cream by our ice cream makers.

Today we are making banana nut ice cream. Right now, different kinds of nuts are being chopped (切碎) in a large chopper. It’s a very expensive machine, but it chops nuts very quickly.

When the nuts and bananas are ready, they 【小题3】 (add) to the sugar and cream in a special machine that 【小题4】 (invent) by Betty a few years ago.

The ice cream 【小题5】 (keep) in a large cold room until it 【小题6】 (send) by trucks all over the country.

That is the end of our tour. Thank you for visiting our factory, and now we’d like to invite you to go to our tasting room, where our delicious ice cream can 【小题7】 (enjoy) by all our visitors.