Now that you are our _____ customer, we will allow you a 10% discount if you buy the dress.
| A．common | B．usual |
| C．regular | D．ordinary |
_________，I'd have done it myself.
| A．If I would have known it | B．If I had have known it |
| C．Had I known it | D．Should I known it |
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 |