What can you see in the school library?
A.
B 
C. 
D. 
The white trainers are nice．Can I________?
| A．try it on | B．try on it | C．try them on | D．try on them |
She doesn’t know________．
| A．what she can do it | B．what to do it | C．how to do | D．how to do it |
His aunt always_________ a black dress．
| A．put on | B．puts on | C．wear | D．wears |
—How often do you clean your classroom? —_________．
| A．Last week | B．In the afternoon | C．For ten minutes | D．Every day |
— ____________, sir?
—I’d like to buy a gift for my friend.
| A．Can you help me | B．What can I do for you |
| C．How are you | D．What about you |