I try to understand __________ that prevents so many Chinese from being as happy as one might expect.
| A．why is it | B．what is it | C．why it is | D．what it is |
In the 16-19 age group，32 of women smoke ______ 28 of men.
| A．comparing to | B．comparing with | C．compared to | D．compare with |
How pleasant the picture is to _______！
| A．be looked | B．for looking at | C．looking at | D．look at |
-What did you think of ______ president?-I didn’t care for him at first，but after ____ time I get to like him.
| A．the; a | B．/; the | C．the; the | D．/; a |
Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
| A．that | B．as | C．so that | D．which |
How pleased the detective was _____ what his customer told him!
| A．hearing | B．heard | C．to hearing | D．to hear |