单项选择题
A.to do B.and to do C.and do D.and doing
The refrigerator is（）we must buy some food.A.bareB.blan...
单项选择题The refrigerator is（）we must buy some food.
A.bare B.blank C.hollow D.empty
These plants are rather difficult（）A.to look afterB.to ...
单项选择题These plants are rather difficult（）
A.to look after B.to be looked after C.being looked after D.looking after
The act of speaking will also help to improve listening...
单项选择题The act of speaking will also help to improve listening comprehension（）
A.to some way B.in the way C.to some extent D.in the extent
