11.Mary went _____ after she finished _____ her work.

11.Mary went _____ after she finished _____ her work.
A.swim; doing B.to swim; to do C.to swim; doing D.swimming; to do
12.Would you mind _____ the window,please?It’s cold outside.
A.to close B.closing C.closed D.close
13.A fridge is used for _____ vegetables and food cool.
A.kept B.keeping C.to keep D.keeps
14.The farmers on the farm are busy _____ apples on the trees.
A.picking B.to pick C.pick D.picked
15.One day when Edison was five years old,his father saw him _____ some eggs.
A.sat B.to sit C.sitting D.was sitting
16.She has no paper ____ .
A.to write B.to write with C.writing on D.to write on
17.When class began,we stopped _____ to the teacher carefully.
A.listening B.listen C.listens D.to listen
18.There are so many kinds of radios in the shop.I can’t decide ____
A.to buy what B.to buy which C.what to buy D.which to buy
19.–Do you often hear John _____ in his room?
-Listen!Now we can hear him _____ in his room.
A.sing; to sing B.singing; singing C.sing; singing D.to sing; singing
20.I usually forget _____ the door,but I remembered _____ it when I left yesterday.A.closing; closing B.to close; to close
C.closing; to close D.to close; closing
21.On June 1,boys and girls are busy _____.
A.to celebrate Children’s Day B.to celebrate Childrens’ Day
C.celebrating Children’s Day D.celebrating Childrens’ Day