Mum won't let Simon go out unless he promises to be back ______ 10 o'clock tonight.( )
A.tillB.beforeC.asD.since
Fresh water ________ more important than anything else.( )
is
are
was
were
﹣Are your grandparents both Americans?
﹣No._____ my grandfather is an American and my grandmother is a Chinese.
Recently
Finally
Actually
Is this the museum you visited last year?
where
that
in which
﹣ This is a photo of our family.Would you like to see it?
﹣ Wow! happy family!
What a
How a
What
There is no light on,they _______ be at home.
mustn't
can't
needn't