________，she can help Mother do housework.
A.As my sister is a child B.A child as my sister is
C.Child as is my sister D.Child as my sister is
The teacher made a request that all the homework ________ before class.
A.should hand in B.must be handed in
C.be handed in D.were handed in
Try to ________ the children’s school life so that they won’t get bored.
A.differ B.change C.describe D.vary
We’re glad to see that the villagers are increasingly ______of the importance of environmental protection.
A.sure B.concerned C.proud D.conscious
—I wonder if Doctor Watt ________ the party tonight.
—I don’t know，but I’ll let you know if he ________.
A.will attend；will come B.will attend；comes
C.attends；will come D.attends；comes
Elephants usually won’t attack a person ________ one becomes a danger to them.
A.until B.although C.unless D.when
