三、改错题（本大题共12小题，每小题1分，共12分）
Correct one error in each of the following sentences.
49．—Did you work out the solution to this problem?
—I am at my wits end with this problem.
50．I’m going to buy a new coat. The weather report says it is very cold.
51．Far is it from me to call him a thief.
52．She talked a long time, and in the end she could make him believe her.
53．The Himalayas have a magnificent variety of plant and animal life.
54．The additional work will take five another weeks.
55．Such chances should never be let to slip.
56．There is something wrong with the car; it needs overhauled.
57．Having paid my taxes, the amount left in the bank is hardly worth mentioning.
58．Just take a look at that fellow, so you’ll get sick.
59．Brown bread and butter are usually eaten with smoked salmon.
60．Not a single page he read the whole semester.
