. Suddenly everyone stopped talking. It became clear that something unexpected _____. But, for a while, I didn’t know what it was.
| A．has happened | B．is happening | C．happened | D．had happened |
I'd rather _________ rudely to her.
| A．you not speak | B．your not speaking |
| C．you didn't speak | D．you hadn't spoken |
He is so strongly built that he looks _________ he could lift an elephant.
| A．if | B．as if |
| C．like | D．that. |
_________ you begin the work, you must carry it out through tothe end.
| A．When | B．Though |
| C．Sometimes | D．Once |
I'll start early, _________ I oversleep.
| A．unless | B．though |
| C．if | D．whether |
I insisted that a doctor _________ immediately.
| A．has been sent for | B．sends for |
| C．will be sent for | D．be sent for |