How about some more ice cream？
No，thanks．It's very good，but I have to _______ my weight，you know．（ ）
| A． |
prevent |
B． |
watch |
C． |
refuse |
D． |
keep |
Some children prefer to eat sweet chocolate _____ it's not good for their health．（ ）
| A． |
because |
B． |
if |
C． |
when |
D． |
though |
I like this watch very much． I _____ it for five years．（ ）
| A． |
have had |
B． |
had |
| C． |
have bought |
D． |
bought |
Our country is 70 years old this year． We will celebrate her _____ birthday on Oct．1．（ ）
| A． |
the seventieth |
B． |
seventieth |
| C． |
the seventy |
D． |
seventy |
Excuse me! Is this your pen？
No， it's not _____． It's Tom's．（ ）
| A． |
hers |
B． |
his |
C． |
mine |
D． |
yours |
I'm sure he is an honest boy． I have no _____ to doubt （质疑） what he said．（ ）
| A． |
reason |
B． |
action |
C． |
feeling |
D． |
decision |