_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.
A. Since B. Unless C. Once D. While
When _______ about their opinion of the effect of modern equipment on their performance of tasks, many young people gave a positive response.
A. asked B. asking C. being asked D. to ask
-----Have you heard the amazing news?
-----But it _______ be true. Anyone with common sense won’t believe it.
A. mustn’t B. can’t C. may not D. shouldn’t
All 5 children of the Blacks, _______ are now working abroad, will come back for their parents’ 50th wedding anniversary.
A. two of whom B. two of them C. both of whom D. both of them
We live in a society _______ there is a great deal of debate about competition.
A. which B. where C. when D. that
With his mother_______ him, he is getting on well with his work.
A. helping B. to help C. help D. helped
