It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.
| A．is | B．are | C．was | D．were |
I really _____ thank you enough. It’s been an amazing day.
| A．needn’t | B．should | C．must | D．cannot |
16. The computer program is a puzzle to me. The more I think of it, the more questions I think of _____.
| A．ask | B．asked | C．being asked | D．to ask |
Realizing I would be late , I quickly dressed my son and _____ my bag, went to work.
| A．carried | B．carrying | C．to carry | D．having carried |
Hard work and lack of sleep has _____ her beauty and youth in recent years.
| A．worn out | B．tried out | C．made out | D．sent out |
In order to _____ the development of the west of our country, many special policies have been made, such as encouraging people to go to work in the west.
| A．accelerate | B．accomplish | C．acknowledge | D．accompany |