Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
| A．only if | B．until |
| C．so that | D．even though |
Please write as________as you can．
| A．careful |
| B．care |
| C．carefully |
| D．more careful |
One fifth of the population in that country________from China．
| A．is |
| B．are |
| C．am |
| D．be |
—________is the population of the city？
—About one million．
| A．What |
| B．How many |
| C．How |
| D．How much |
China has________population in the world．
| A．the bigger |
| B．the biggest |
| C．the more |
| D．the most |
Jinan is bigger than________in Shandong．
| A．all the cities |
| B．any city |
| C．any other city |
| D．some cities |