Everyone has periods in their lives ______ everything seems very hard.
| A．when | B．where | C．which | D．that |
I was on the highway when this car went past followed by a police car. They ______ at least 150 kilometers an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
All the teachers discussed the plan that they would like to see __________ in the next school year.
| A．carry out | B．carried out | C．to carry out | D．be carrying out |
I still remember __________ chess in class by my teacher about twenty years ago.
| A．to be caught to play | B．being caught playing |
| C．catching play | D．having caught playing |
The shopkeeper did not want to sell for ______ he thought was not enough.
| A．where | B．how | C．what | D．which |
You can’t imagine what great trouble they have _________ the problem_______.
| A．to solve; being talked about | B．solving; discussing |
| C．to solve; to talk about | D．solving; being discussed |