We didn’t start our discussion _____ everybody arrived.
| A．since | B．if | C．while | D．until |
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. |
How about inviting Miss Liu a picnic with us ?
| A．have | B．has | C． having | D．to have |