When he knew the disappointing result of the exam, he seemed quite ____.
| A．cast down | B．of caution | C．in vain | D．in good condition |
-----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 |
In the past half-century, average incomes _______ quickly in developed countries, yet happiness levels have remained almost the same.
| A．have risen | B．had risen | C．rose | D．rise |