It's a little cold，especially at night，________it's in May now．
A. and B. so
C. though D. or
—Don't forget to come to our school assembly(集会)．
—I won't．I________just now．
A. told B. was told
C. spoke D. was spoken
When Jim'S mother came in，he________his homework．
A. is doing B. has done
C. was doing D. had done
This morning my mother asked me________．
A. why he is not here
B. where Julia went last weekend
C. what time is it
D. how did my brother do it
Tom didn't work hard at his lessons．________，he failed in his exams．
A. By the way B. such as
C. For example D. As a result
—Is that man in a red T-shirt Mr Smith?
—It________be Mr．Smith．He is on the way to London now．
A. must B. mustn't
C. can D. can't
