He traveled to many mountain villages and saw many poor children out of school. This experience his life.
| A．would change | B．had changed | C．was to change | D．was changing |
— Lisa hasn't lived here for long. She _____ know many people.
| A．needn’t | B．can’t | C．shouldn’t | D．didn’t |
— There's someone outside. Who it be ?
— It must be Mary. She promised to come over at 8: 00.
| A．must | B．can | C．shall | D．need |
Recently quite a lot of experts _____ that another law on wildlife protection ____ as soon as possible.
| A．suggested; must be passed | B．have suggested; be passed |
| C．were suggesting; was passed | D．suggested; being passed |
— Why! I _____ get you on the phone.
— We ______ basketball on the playground when you phoned.
| A．didn't; must be playing |
| B．couldn't; must be playing |
| C．couldn't; must have played |
| D．didn't; must have been playing |
Often, when he ______ something that ______ him, he wasted his time drawing some little pictures.
| A．should be doing; gave |
| B．should have been doing; was given |
| C．should do; was given |
| D．should have been doing; had given |