---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t |
| C．couldn’t | D．may not |
Peng Liyuan, First Lady of China invited Obama’s wife and his children to visit China March, 2014.
| A．a; on | B．the; in |
| C．a; in | D．the; on |
---I’ll try harder next time.
---You have said it one hundred times. But _____.
| A．the early bird catches the worm |
| B．a friend in need is a friend indeed |
| C．you can’t burn the candle at both ends. |
| D．actions speak louder than words |
---Boys, don’t swim in the Fengcheng River!
---Why not? Isn’t it deep enough _____?
| A．to swim across | B．to swim in |
| C．swim on | D．swimming on |
Whether we will hold the sports meet _____ the weather.
| A．gets up | B．sets up |
| C．gets used to | D．depends upon |
If we don’t save energy, it _____ some day.
| A．will be run out | B．has been run out |
| C．will run out | D．has run out |