If your best friend tells you his secret，it's ___ for you to keep them for him．By doing this，you can win others'trust．（ ）
| A． |
special |
B． |
necessary |
C． |
possible |
﹣I tried many ways to solve the problem， but of them worked．
﹣Never give up． You' ll surely make it．（ ）
A．allB．noneC．neither
Tony is the best student in the class because he works than the others．（ ）
A．hardB．harderC．hardest
﹣Must I hand in the survey on the use of bicycle﹣sharing right now？
﹣No， you ．（ ）
A．needn'tB．can'tC．shouldn't
﹣Do you enjoy Chinese Folk Songs？
﹣Yes， the folk songs nice．（ ）
A．soundB．smellC．look
I will give a T﹣shirt my brother as a birthday present．（ ）
A．byB．toC．from