He is very serious. No one can make him___.
A．laugh B．laughs C．to laugh D．laughing
—I knocked into a tree when I went to the bus stop for my friend.
—I suppose you _____too fast.
A．had driven B．are driving C．drove D．were driving
this key is your mother’s.
A．May B．Maybe C．May be D．Can
You don’t know ______ I want to see you again. It’s a year since I last saw you.
A．how soon B．how long C．how much D．how often
---Where’s Li Hua?
---Look! He _______ tennis on the playground.
A．plays B．played C．was playing D．is playing
With the help of the new technology, you __ e-mail your friends by mobile phone.
A．can B．must C．need D．should
