15. He ________ his doctor’s care ________ he is quite well again.
| A．owes it to; what | B．owes to; that | C．owes them to; that | D．owes it to; that |
The population, one third of which___ farmer workers, __increasing very fast.
| A．is; are | B．is; is | C．are; is | D．are; are |
It is generally believed that _____ study, we can gain both knowledge and skills.
| A．with | B．through | C．by | D．at |
At the foot of Yuelu Mountain ____, which is one of the most famous middle schools in China.
| A．does our school lie | B．does lie our school |
| C．our school lies | D．lies our school |
A Hope School will be built in_____ used to be a temple.
| A．where | B．what | C．which | D．that |
There is clear evidence _____ smoking does harm to our health.
| A．where | B．what | C．which | D．that |