We _____ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working |
| C．worked | D．had worked |
She always come to our help when we get into trouble ____ she is very busy.
| A．since | B．once |
| C．even if | D．so that |
Peter is so ___ that he won’t change his mind; we’d better give up the idea.
| A．reliable | B．stubborn |
| C．patient | D．careless |
Tell me when you ________ at the airport, Alice. I’ll go there to meet you if I’m here.
| A．arrive | B．would arrive |
| C．have arrived | D．are arriving |
The visitor ____ that he ______very glad to visit our country.
| A．said; was | B．said; had been |
| C．told; was | D．spoke; had been |
It’s difficult to ______ the football fans, who were crazy about the victory.
| A．put down | B．turn down |
| C．calm down | D．get down |