当你想了解某个物品的颜色时，你可以问：
A．What’s this？ B．What colour is it？ C．What’s your name？
Apples are sweet _______ fall.
A. onB. inC. at
---__________?
---They are listening to music.
A. What do they do?
B. What are you doing?
C. What are your grandparents doing?
There is a call ____ you.
A. forB. onC. at
---______ do you like summer?
---______ I can swim in the river.
A. Why, BecauseB. Why, AndC. Which, Because
---What is Mike doing?
---He ____________.
A. runningB. swims in the riverC. is walking