选词填空

under threat;respond to;up and down;be host/home to;be made up of

【小题1】Receiving a text does not mean you need to ________________it immediately.
【小题2】The Tibetan mountain areas ________________antelopes and other rare animals.
【小题3】Alex walked________________in the room within the hours of waiting for the result,looking worried.
【小题4】Air pollution is what most people are concerned about nowadays,because their health is ________________.
【小题5】We all know the theory that food________________carbohydrates,proteins and fats.