From space, the earth looks blue. This is _______ about seventy-one percent of its surface is covered by water.
| A．why |
| B．how |
| C．because |
| D．whether |
Though ______in a big city, Peter always prefers to paint the beautiful scenes of country life.
| A．raised | B．was raised | C．raising | D．raises |
Please give Jim the schedule for tomorrow's conference when he _______ back. He is to chairthe conference.
| A．will come | B．came | C．comes | D．is coming |
I'm going to spend the winter vacation in Shanghai,_______I have relatives.
| A．which | B．that | C．where | D．when |
________ you ought to do now is to see a doctor at once.
| A．How | B．That | C．Which | D．What |
The medicine is on sale everywhere. You can get it at _______ chemist's.
| A．other | B．some | C．another | D．any |