I should not have laughed if I ______ you were serious.
| A．thought | B．would think |
| C．had thought | D．have thought |
The missing boy was last seen ____ in the park with other children.
| A．play | B．playing |
| C．played | D．to play |
_____ to the nearest hospital, the injured boy was treated without delay and has been out of danger.
| A．Rush | B．Rushing |
| C．To rush | D．Rushed |
It is demanded that the system of buying train ticket in real names _____ out during the Spring Festival.
| A．will be carried | B．be carried |
| C．to be carried | D．should carry |
- You must have missed the last train to Guangzhou the other day.
- Oh, no, I _____.
| A．haven’t | B．hadn’t | C．don’t | D．didn’t |
The accident has reached a point _____ the police have to be called in.
| A．when | B．that | C． which | D．where |