David， ______you please sweep the floor and take out the trash？（ ）
| A． |
Could |
B． |
may |
C． |
might |
D． |
must |
Nowadays people wish to have ______ food than before as their life improves．（ ）
| A． |
healthy |
B． |
healthier |
| C． |
healthiest |
D． |
the healthiest |
Alex believes he will soon be able to play chess as ______ as the computer．（ ）
| A． |
well |
B． |
better |
C． |
best |
D． |
the best |
Did the policeman give much _______ on how to protect personal information？（ ）
| A． |
note |
B． |
tip |
C． |
advice |
D． |
book |
_______ knowledge and experience are important to finish that task．（ ）
| A． |
Either |
B． |
Neither |
C． |
None |
D． |
Both |
The headmaster introduced ______ to the German visitors before the welcome party．（ ）
| A． |
we |
B． |
us |
C． |
our |
D． |
ours |