.
_____ you have a complaint to make, do something about it right away. The longer you wait, the harder it will be to get your complaint resolved.
| A．If | B．Unless | C．Though | D．Since |
The universities have got bigger in size, ____ many more people the chance of higher education.
| A．so allowing | B．thus allowing | C．so to allow | D．thus to allow |
It is believed that hard work is the ____ of one’s success.
| A．purpose | B．goal | C．guarantee | D．achievement |
.A poet and writer___ coming to speak to us about Chinese literature and painting tomorrow.
| A．is | B．are | C．was | D． were |
—what do you think of Bill?
—He is a hard-working student and he always ____himself in study.
| A． spends | B．takes | C．buries | D． costs |
we were all happy _____ 51 gold medals in all in the 29th Olympic Games.
| A．to have won | B．to won | C．winning | D． won |