I was out town at the time, so I don’t know exactly how it ____________________.
A.has happened | B.happened | C.happens | D.was happening |
---______ the farmers discovered the entrance to the secret cave in the valley?
--- Totally by chance.
A.When was it that | B.How was it that | C.How it was that | D.When it was that |
One more month, _______ the grapes in the yard will be ripe.
A.or | B.otherwise | C.but | D.and |
_______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 |