John, you _______ stay out too late. Your mother will worry about you.
| A．needn’t | B．shouldn’t |
| C．must | D．can |
Please check your paper to ________ there are no mistakes.
| A．think of | B．try out | C．find out | D．make sure |
Liu Xi's father kept on____although he was tired.
| A．to sleep | B．sleeping | C．to work | D．working |
World Cup host Brazil would like to help China________China's soccer.
| A．improve | B．send | C．question | D．discuss |
Mrs. Green promised____all she can to help us.
| A．knowing | B．to know | C．doing | D．to do |
Dale is studying in________university and he wants to be________engineer.
| A．a，a | B．a，an | C．an，a | D．an，an |