I'm awfully sorry for bringing you so much trouble．
__________（ ）
| A． |
Never mind． |
B． |
It's a pleasure． |
| C． |
Of course not． |
D． |
You are welcome |
Please______the rubbish into different litter bins according to the signs．（ ）
| A． |
puts |
B． |
put |
C． |
putting |
D． |
to put |
The self﹣driving plane proves to be useful in many ways．___smart invention it is!（ ）
| A． |
What |
B． |
What a |
C． |
What an |
D． |
How |
Sue practises______the violin hard and often gives wonderful performances．（ ）
| A． |
play |
B． |
played |
C． |
to play |
D． |
playing |
The debate on whether to keep pets_____forty minutes yesterday afternoon．（ ）
| A． |
last |
B． |
lasted |
C． |
will last |
D． |
has lasted |