My mother’s birthday is coming, I don’t know _________for her．
| A．why to do | B．how to wear |
| C．when to go | D．what to buy |
My next door neighbor is so kind _____he is always ready to help others.
A. that B. when C. but
The people there are _______ . So they often talk_______
A. friend ；happy B. friendly; happily C. friend; happily
1 often hear her __.this song. Listen! Can't you hear her___ in the next room?.
A. sing; sing B. singing; singing 
C. sing; singing
The old parents _____a great deal of their savings on their son’s new house.
A. cost B. spent C. paid
— May I do the homework tomorrow?
一 No, you______. You should hand in before class tomorrow.
A. mustn't B. needn't C. couldn't