Whose textbook is it? Is it Jenny's?
No, it ________ be Jenny's. Look, Helen's name is on the cover. I think it ________ be Helen's.
( )
A.can't;mustB.mustn't;must
C.can't;mayD.mustn't;may
He has many friends at school._____?( )
has he
does he
doesn't he
isn't he
Mary____ a math problem with her classmates when the math teacher knocked at the classroom door.( )
has discussed
was discussed
was discussing
discusses
______you practice, _________you will be at math.( )
The more; the better
The more; the best
The most; the better
The most; the be
Jack has learned more about teamwork(团队合作) _______ he joined the soccer team.( )
until
since
while
though
_____ my friends _______ I like playing computer games because we think it wastes time.( )
Both; and
not only; but also
Either; or
Neither; nor