My mother is ill in hospital. I have to ___________ my grandparents at home.
| A．look after | B．look for |
| C．look up | D．look out |
—How many people did you see in the meeting room?
—.
A．Nothing B．No one C．None
—He is late for the meeting.
—
A．So I am. B．So am I. C．So do I.
—What a nice motorbike! How long have you it?
—About half a year.
A．had B．bought C．taken
There are several chemical factories waste water into the river.
A．pour B．pouring C．pours
Last year，the population of that city 7,120,000.
A．was B．were C．has