Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.
A. a; a B. a; the C. 不填; a D. the; 不填
Is it John that is being scolded in the manager’s office?
No. It ______ be him. I saw him on the way just now.
A．mustn’t B．won’t C．can’t D．may not
The question came up at the meeting_____ we had enough money for our research．
A．that B．which C．whether D．if
Twenty of the students will have sports, the rest ___ studying here
A.are B.is C.were D.was
He is a strict but kind-hearted father, ____ the children respect but are afraid of.
A. / B. that C. for whom D. one whom
She ______ behind the door in order not to be found. Two minutes later she was safe again.
A. hold her breath B. catch her breath
C. held her breath D. lost her breath
