Read and choose the suitable sentences. (根据句意选择恰当的句子)
1. 当你想问对方正在做什么时，可以说：______________ [ ]
A. What are they?
B. What are you doing?
C. What are you going to do?
2. 当你想问对方有什么时，可以说：___________________[ ]
A. Have you got a camera?
B. What do you haw
C. I have an English book.
3. 当你想表达我们正在做实验时，可以说：______________ [ ]
A. We are doing an experiment.
B. We are catching!
C. We are counting insects.