---Where are the keys?
---________
A. They are in the door.
B. It's in the door.
My dad is good at ____________ bikes.
A. repairing
B. to repair
C. repair
I want to ____________ the school team.
A. join to
B. join
C. to join
____________ the long winter，spring is finally here.
A. after
B. Before
C. After
The ____________ and the grass will soon come out.
A. leaf
B. leaves
C. leafs
Everything will ____________ green again.
A. be
B. are
C. is