She put back the book she had taken________mistake．
| A．in |
| B．up |
| C．to |
| D．by |
I find it hard ____ to drive a car.
A. to learn B. learning C. Learns
How long ____ his grandfather ____ ?
A. has, been dead
B. has, died
C. did, die
We’d better ____ out .It’s going to rain.
A. not to go B. don’t go C. not go
Shanghai is a beautiful city. I _____ there twice .
A. went B. have gone C. have been
He used ___ in the morning , but now he gets used _____ after supper.
A to study, studying
B. to study, to studying
C. to studying , to study