There’s no way of knowing why one man makes an important discovery __ _ another man, also intelligent, fails.
A. since B. if C. as D. while
The doctor will see you again next week. _____, you must rest as much as possible.
A. Somehow B. However C. Meanwhile D. Indeed
Of all the books on the shelf, is of any use for improving our practical skills of survival in the competitive world.
A. nothing B. no one C. neither D. none
—How was your recent trip to England?
—I’ve never had ______ one before.
A. the most pleasant B. a more pleasant
C. a most pleasant D. a pleasant
When you talk about a person’s _____, you are referring to the country, race, or social class of their parents or ancestors.
A. origin B. nationality C. generation D. relation
In ____ accident _____ knowledge of first aid can make _____ real difference.
A. an; a; a B. the; a; the C. an; the; 不填 D. a; a; 不填
