1．These are their motives for doing it.
2．The river widens considerably as it begins to turn west.
3．Henry cannot resist the lure of drugs.
4．These programmes are of immense value to old people.
5．A great deal has been done to remedy the situation.
6．John is collaborating with Mary in writing an article.
7．He is determined to consolidate his power.
8．Many scientists have been probing psychological problems.
9．Hearing problems may be alleviated by changes in diet and exercise habits.
10．All the cars are tested for defects before leaving the factory.
11．The food is insufficient for three people.
C inexpensive D．inadequate
12．Thousands of people perished in the storm.
13．But in the end he approved of our proposal.