Once _____ , the machine will keep running.
| A．start | B．started | C．to start | D．starting |
I would like to have room , window of which opens to south.
| A．a; the ;a | B．a ;the ; the | C．a ; 不填；不填 | D．a; the；不填 |
—Mr. White didn’t come last night ,did he?
—No ,we for him. A whole night was wasted.
| A．had waited | B．have been waiting |
| C．were waiting | D．had been waiting |
You said the books were on the shelf ,but there.
| A．there was no oneycy | B．there were none |
| C．there were no ones | D．was none |
Within the last year, scientists have come closer than ever .
| A．to deciding which of the questions is right |
| B．to decide which of the questions is right |
| C．deciding whether the question is right or not |
| D．and decided which of the questions is right |
It is heartening to see millions on the earth who had nothing but a record of misery and hunger
the chance to improve their life.
| A．having | B．to have | C．have | D．who have |