_______the past two months he has been busy with his school work.
| A．For | B．On | C．Since | D．At |
______can you stay there? --For two weeks.
A. How long
B. How far
C. How often
It’s ___6:00 . Let’s go home.
A . at B. on C. around
Shanghai is bigger than _____ city in China.
A. any B. other C. any other
The teacher tells us not ______a hat in class.
A. wear B. wearing C. to wear
Most animals walk ____ four legs.
A. of B. to C. on