Teenagers should not be allowed___________.
A. smoke B. to smoke C. smoking
They used to go to the park to take a walk ,________?
A. don't they B. didn't they C. aren't they
--Shall we climb hills this Sunday?----______________.
A.Good idea B.You’re welcome C.You’re right
--I wonder________________.------Maybe she had something important to do.
A.why she left early
B.why did she leave early
C.why left she early
My brother ______quiet,but now he is outgoing.
A.was used to B. used to C. used.to be
In our school library there a number of books and the number of them growing larger and larger.
A. is; are B. has; is C. are; is
