Mike likes to watch the birds _________ in the sky.
| A．flys | B．flying |
| C．flies | D．fly |
They decided at the end of this month.
| A．to leave | B．going back | C．travel | D．not start out. |
are made of
| A．Glasses; glasses. | B．Glass; glass | C．Glasses; glass. | D．not start out. |
Mr. Wu came into the classroom , a book in his hand.
| A．hold | B．holds | C．holding | D．held |
He sat downa computer.
| A．in the front of | B．in front of | C．in front | D． front of |
She learns more about her job
| A．day by day | B．day to day | C．one by day | D．one after one. |