They sometimes go on working ____ the light of the moon.
| A．on | B．under | C．by | D．for |
He is a foreigner, ___ I knew from his accent.
| A．which | B．as | C．that | D．A and B |
Betty always tells lies，___ her parents find strange.
| A．that | B．/ | C．which | D．as |
____ we know now, oceans cover more than 70 percent of the earth.
| A．That | B．Which | C．As | D．What |
We must teach her a good lesson ___ she likes it or not.
| A．whether | B．if | C．that | D．which |
We don't know ___ to pay a visit to the old town.
| A．whether | B．if | C．that | D．which |