________do you usually go to bed？
| A．What time |
| B．How |
| C．Where |
| D．Who |
I can solve these problems my own.
| A．by | B．on | C．to | D．of |
There are two workers shouting in the square.
| A．thousands | B．thousand |
| C．thousands of | D．thousand of |
Don’t worry. He is to take care of little Betty.
| A．carefully enough | B．enough carefully |
| C．careful enough | D．enough careful |
Some girls feel if they see a snake.
| A．frighten | B．frightened |
| C．frightening | D．to frighten |
It is difficult for a baby pandain the wild.
| A．to survive | B．survive |
| C．survived | D．surviving |