A person ________ with H7N9 viruses will be more likely to die of lung dysfunction.
| A．developed | B．infected | C．injected | D．progressed |
Many countries are increasing their use of natural gas, wind and other forms of ______.
| A．energy | B．power | C．force | D．strength |
It may not be a great suggestion. But before ______ is put forward, we will make do with it..
| A．a best one | B．the best one | C．a better one | D．a good one |
Try not to cough more than you can ______ since it may cause problems to your lungs.
| A．help | B．stop | C．allow | D．check |
He was unhappy when he sold his guitar. After all, he ______ it for a long time..
| A．had had | B．has had | C．has | D．had |
Animals are obviously ______ lower form of life than ______ man.
| A．the;the | B．a;/ | C．a;the | D．/;/ |