__May 5th，2017，the C919 took off successfully for the first time at Shanghai International Airport．（ ）
| A． |
On |
B． |
In |
C． |
At |
D． |
Of |
﹣﹣﹣They've bought the sick children some toys and flowers.
﹣﹣﹣So they have._________nice of them!（ ）
| A． |
How |
B． |
What |
C． |
How a |
D． |
What a |
It's not ___________to talk with your mouth full.（ ）
| A． |
boring |
B． |
polite |
C． |
terrible |
D． |
sleepy |
I have a few books on Chinese food.You can borrow ___________ if you want.（ ）
| A． |
one |
B． |
it |
C． |
much |
D． |
a little |
﹣﹣﹣What's twenty and fifty？
﹣﹣﹣It's ____________________.（ ）
| A． |
fifty |
B． |
seventy |
C． |
eighty |
D． |
ninety |
If the weather is nice，we could have a（n）___________ in the park.（ ）
| A． |
picnic |
B． |
chance |
C． |
place |
D． |
idea |