1.There is a door __A___the wall.
A.in B.on C.under D.behind
in the wall (穿透墙的东西)在墙上 ,on the wall在墙的表面上
2.Let Jim _C___you with your English.
A.helps B.to help C.help D.helping
[let sb do sth.]
3.The teachers often help Helen __D___the flowers.
A.waters B.with water C.watering D.water
[help sb.(to) do sth.]