— Is the man over there Mr Black?
— It _______ him. He has gone to England.
| A．must be | B．can’t be |
| C．may be | D．mustn’t be |
You never know how much difficulty we had _________________ the problem. Luckily, we try to solve it with Mrs Wu’s help.
| A．working out | B．work out |
| C．worked out | D．to work out |
--- How hard-working the teachers are!
--- I agree with you. The teachers are always strict __________us.
| A．at | B．on | C．in | D．with |
The film has ___________ for half an hour. Shall we give it up?
| A．last | B．be on | C．been on | D．been lasted |
The song “trouble is friend” is worth _______________________.
| A．to listen | B．listening |
| C．listening to | D．to listen to |
— Why do you look so sleepy in class, John?
— Sorry, sir. I __________________ to watch a live Music Festival last night.
| A．kept up | B．made up |
| C．stayed up | D．put up |