Yuan Longping's ______to our country is amazing．
I agree． He and his team even start to plant saltwater rice．（ ）
A．celebrationB．conversation
C．contributionD．collection
July is the seventh of the year．
Carol often goes to school bike． It's good for her health．
﹣Could you please tell me ？
﹣At the supermarket across from our school．（ ）
| A． |
where can I buy some masks（口罩） |
| B． |
when I can buy some masks |
| C． |
when can buy some masks |
| D． |
where I can buy some masks |
﹣Michael， shall we go hiking in the mountains next Sunday？
﹣OK． it rains heavily．（ ）
| A． |
when |
B． |
until |
C． |
unless |
D． |
if |
﹣Mom， I watch my favorite TV show Evefasting Classics（经典咏流传） now？
﹣I'm afraid you can't． You must do the dishes first．（ ）
| A． |
need |
B． |
must |
C． |
will |
D． |
may |