His sister usually helps him________his homework．
A．doing
B．do
C．does
D．to doing
(2013苏州)—Your tea smells great！
—It’s from India．Would you like________？
A．it
B．this
C．some
D．little
(2013菏泽)The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9．
A．how
B．what
C．where
D．when
改为同义句
Each of the students in the class has been to the Great Wall．(改为同义句)
________ ________in the class has been to the Great Wall．
她自愿在当地医院工作。
She volunteers________ ________at the local hospital．
—What do you usually help your mother________？
—I often do the dishes．
A．to doing
B．to do
C．doing
D．does
