The dog may be a good companion for the old.___,the need to take it for walks may be a disadvantage
This method must be effective ,for I’ve seen it ____ jobs by many different people.
二.单项选择Mr. Li_____a secretary for five years in the company, and now he is the general manager of it.
_____, I could not memorize the text.
The reason______she gave for being absent was______the heavy snow prevented her coming.
Rather than_______on a crowded bus,he always prefers______a bicycle.