-How long has the United Nations __________？
-__________1945.
| A．come into existence; In |
| B．been in existence; Since |
| C．been in existence; From |
| D．come into existence; For |
The number of the people who _______ cars _______ increasing.
| A．owns; are | B．owns; is | C．own; is | D．own; are |
I shall never forget those years _______ I lived on the farm with
the farmers, _______ has a great effect on my life.
| A．when; who | B．that; which | C．which; that | D．when; which |
--- Did you ask the guard _______ happened?
--- Yes, he told me all _______ he knew.
| A．what; that | B．what; what | C．which; which | D．that; that |
Smoking, _______ is a bad habit, is, however, popular.
| A．that | B．which | C．it | D．though |
You can depend on whatever promise _______ he makes.
| A．/ | B．why | C．when | D．whose |