I always go to the lake ____ the aftenoon, but Kate goes there ____ the night of Monday.
| A．in; in | B．in; on |
| C．on; in | D．on; on |
Now more and more people are trying _____ using plastic bags, wooden chopsticks and napkins to protect the environment.
| A．stop | B．to stop | C．stopping | D．Stopped |
Yu Min _____ in the physics field for many years. He is called the Father of Hydrogen Bomb (氢弹之父). He in the winner of the award for Supreme Science and Technology of China,
| A．has worked | B．works |
| C．worked | D．had worked |
Neither the children nor their mother _____ scary movies when Mr White is away.
| A．enjoy | B．enjoyed | C．enjoys | D．enjoying |
--- Lily, whose backpack is this?
--- I think it _____ be Peter’s. Look! His name is on it.
| A．can | B．should | C．must | D．Could |
The group of people _____ the hotel after walking for 6 hours. They needed to have a rest.
| A．arrived at | B．arrived in | C．got | D．Reach |