My father asks me in the street．It's dangerous．（ ）
| A． |
not to play |
B． |
not play |
| C． |
not playing |
D． |
don't play |
﹣Many boy students think math is ______ English．
﹣I agree．I'm weak in English．（ ）
| A． |
much difficult than |
B． |
so difficult as |
| C． |
less difficult than |
D． |
more difficult than |
Do you want to be healthy？______．Smiling can help you stay healthy．（ ）
| A． |
Smile |
B． |
Smiling |
C． |
Smiles |
D． |
Smiled |
﹣I want to borrow the book，but I don't know how long it may ______．
﹣For two weeks．（ ）
| A． |
keep |
B． |
be borrowed |
C． |
borrow |
D． |
be kept |
I hope everyone can care about ______ the environment and stop ______ things．（ ）
| A． |
protecting； wasting |
B． |
protecting； to waste |
| C． |
protect； wasting |
D． |
protect； to waste |
﹣﹣George，how can you prove（证明）the earth is round？
﹣﹣I can't，sir．_______，I never said it was．（ ）
| A． |
Except |
B． |
Unless |
C． |
Besides |
D． |
Including |