Air pollution is getting more and more serious, so we must take action __________ it is too late.
11. In the past few years, my hometown has changed_____ recognition.
10. Heart trouble is one of the most serious _____ of death among old people.
9. This shop sells _____ clothing.
8. Most of us would rather send e-mail as it has____of the troubles of sending letters via the post office.
7. ------ We should save some food for _____ who arrives late. ------- There is no need. _____ is here.