________   small, the company has about 1，000 buyers in over 30 countries.

A. As                B. If

C．Although          D．Once

He is so busy. He cannot afford enough time with his son   ________ he wants to.

A．even if             B．as if

C．because            D．before

________   we have enough evidence, we can't win the case.

A．Once                  B．As long as

C．Unless                D．Since

I have heard a lot of good things about you I came back from abroad.

A. since               B. until

C. before             D. When

Don't turn off the computer before closing all programs, ________   you could have problems.

A. or                B. and

C. but               D. so

I was glad to meet Jenny again,   ________     I didn't want to spend all day with her.

A. but               B. and

C．so               D．or

It's not easy to change habits, ________ with awareness and self－control, it is possible.

A．for             B．or

C．but            D．so

Cathy had quit her job when her son was born _______ she could stay home and raise her family.

A. now that          B. as if

C. only if             D. so that

The meaning of the word "nice' changed a few tines  it finally came to include the sense "pleasant."

A. before              B. after

C. since                D. while

Lessons can be learned to face the future, ________ history cannot be changed.

A. though               B. as

C. since                 D. unless