Too many cars are_____to be environment，so we'd better take the bus more．（ ）
| A． |
useful |
B． |
harmful |
C． |
helpful |
D． |
meaningful |
Sally_______where she had left the car and the police found it this morning．（ ）
A．forgotB．has forgotten
C．forgetsD．had forgotten
In the past 70 years， China______historic changes and made great achievements．（ ）
A．experiencedB．has experienced
C．experiencesD．would experience
Is Helen here？
Not yet， but she_________in half an hour．（ ）
A．arrivesB．will arrive
C．arrivedD．has arrived
Do you think teenagers can't have a part﹣time job？
_____________．They may learn from working．（ ）
A．It's nothingB．Don't mention it
C．Hard to sayD．That's all right
I hear you've got an "A" in your English test． Congratulations!
____________．（ ）
A．It's a pleasureB．Take it easy
C．Many thanksD．You' re welcome