— Why didn’t you come to play football with us yesterday afternoon?
— I ________ my mother with the housework then.
| A．was helping | B．helped | C．had helped | D．have been helping |
If everyone makes a ___________ to protecting the environment, the world will become much more beautiful.
| A．communication | B．Competition |
| C．contribution | D．Conversation |
Keep quiet, please! You must know talking loudly________ in the reading room.
| A．is not allowed | B．is allowed |
| C．doesn’t allow | D．Allows |
These new types of energy from the sun, wind and water cost very little and will never ________.
| A．run out | B．wash out |
| C．wear out | D．put out |
— May Day is coming up. Have you decided ________?
— I’m planning to go on a trip to Hangzhou.
| A．when you’re going to spend it |
| B．how often are you going to spend it |
| C．where you’re going to spend it |
| D．how are you going to spend it |
It’s much easier for us to become friends________ we share similar interests.
| A．unless | B．when | C．even though | D．so that |