三、例題
1. It was from the earliest time ______men began to study the natural phenomena and heavenly bodies.

A. when B. where
C. that  D. how
2. It ______ his father ______ made him a lawyer.
A. were…that  B. was…that
C. was…which D. is…which
3. What ______ are you looking for?
A. hell  B. the hell
C. a hell  D. hells
4. He is ______ honest because he often tells lies.
A. anything but  B. nothing but
C. something but  D. but anything
5. You are quite wrong. She ______ like you.
A. can        B. has        C. should       D. does
6. ______, it is quite easy to drill a hole on it with laser.
A. Hard although the diamond is        B. Hard as the diamond is
C. As the diamond is hard  D. How hard is the diamond
7. It was ______ it raised many difficult questions that the book took a long time to come out.
A. since       B. because       C. after      D. when
8. It was the color of the material ______ he was surprised at.
A. who  B. whom    C. which    D. what
9. It is ______ he is determined.  
A. buying a new car that  B. to buy a new car that
C. to buy a new car what  D. buying a new car which
10. It was not until be arrived at the railway station ______ he realized he had forgotten his ticket.
A. before       B. since      C. when      D. that
11. It was with great joy ______