We can never expect________bluer sky unless we create________less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
It sounds like something is wrong with the car’s tyre. , we’d better take it to the garage immediately.
| A．Otherwise | B．If not |
| C．But for that | D．If so |
The abrupt change of the climate has drawn __________ worldwide attention to __________ benefit of green energy .
| A．a ; / | B．/ ; the |
| C．a ; the | D．the ; / |
Born into a family with three brothers and two sisters, Peter wasto value the sense of sharing.
| A．brought up | B．turned down |
| C．looked after | D．held back |
We must take two aspects into consideration , both of _______ associated with the safety of the students .
| A．which | B．them |
| C．that | D．whom |
---Do you think he will do me a favor?
---As far as I know, he is the last one to help others. He _______ be prepared to give you a hand, though.
| A．might | B．must |
| C．can | D．should |