It's very hot in summer．These flowers should ________ every day．

1. A.
   water
2. B.
   are watered
3. C.
   are watering
4. D.
   be watered

It's very hot in summer. It's best to wear ________ clothes.

　　A.cool　　B.warm　　C.cheap　　 D.cold

Because it’s very hot in summer, people often sleep_____the windows____at night.

A. with; open            B. with; opening       

C. in; opening            D. in; open