—Should I water the flowers every day?
—Yes. Most house plants require ________regularly.
A.watering | B.being watered |
C.to water | D.to be watering |
To those scientists, it still remains to be a question ______ man can go back to the old days with time machine.
A.if | B.that | C.how | D.whether |
There is a common belief among them _______ rubbish can and should be put into good use.
A.which | B.if | C.whether | D.that |
We never doubt ______ our school team will win the match against No. 3 Middle School.
A.whether | B.that | C.if | D.what |
The teacher usually grades the students on _______ they have behaved.
A.that | B.what | C.which | D.how |
Once _____, it won’t be easily forgotten.
A.saw | B.seeing | C.seen | D.see |