——Hi, Steve, you look tired.
——I am tired. I ______ the living room all the afternoon.
| A．painted | B．had painted | C．have been painting | D．have painted |
— Sorry, Sir. I didn’t quite follow you.
— ______. I’ll explain it to you later.
| A．Don’t mention it | B．Come on | C．That’s right | D．Don’t worry |
When you’ve finished school, don’t forget to come back to visit your school, ______?
| A．will you | B．do you | C．have you | D．won’t you |
Humans are destroying nature day by day, ________, of course, will cause punishment sooner or later.
| A．that | B．/ | C．which | D．What |
The school _______ I visited the other day was not the one _______ I once studied.
| A．that; which | B．which; where | C．where; which | D．where; where |
Is this the reason____ at the meeting for his carelessness in his work?
| A．he explained | B．what he explained |
| C．how he explained | D．why he explained |