Fresh water ________ more important than anything else．（ ）
| A． |
is |
B． |
are |
C． |
was |
D． |
were |
﹣Are your grandparents both Americans？
﹣No._____ my grandfather is an American and my grandmother is a Chinese.
| A． |
Recently |
B． |
Finally |
C． |
Actually |
Is this the museum you visited last year？
| A． |
where |
B． |
that |
C． |
in which |
﹣ This is a photo of our family.Would you like to see it？
﹣ Wow! happy family!
| A． |
What a |
B． |
How a |
C． |
What |
There is no light on，they _______ be at home.
| A． |
mustn't |
B． |
can't |
C． |
needn't |