There ________ great changes in China in the past twenty years. All of us are proud of it.
A.have been B.has been C.was D.were
— How soon shall we leave the airport?—We won't leave ________ we make sure that everything is OK.
A.because
B.until
C.as soon as
D.if
—Most teenagers ________ the heroes and usually follow them to behave.
—I think they should hold a right opinion. To be oneself is also important.
A.look forward to B.look up to
C.communicate with D.get on well with
—Why are you so sleepy?
—We ________ to finish the work on time, so we went to bed too late.
A.asked B.were asked C.was asked D.had been asked
You may do it by yourself, ________ ask someone else for help.
A.but B.and C.so D.or
About ________ of the land ________ covered with trees and grass.
A.three fifth; are B.three fifths; are C.three fifths; is D.third five; is
