Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
A.why | B.how | C.unless | D.where |
The development of industry has been ______ gradual process throughout ______ human existence, from stone tools to modern technology.
A.不填;the | B.the;a | C.a; 不填 | D.a; a |
We should get prepared for dealing with ________problems_________.
A.any, arise | B.which, are arisen | C.whatever, arise | D.what, are arisen |
---You’ve read the Frog by Moyan , haven’t you?
---Yes, I_______ second time and I got a better understanding.
A.have read a | B.had read the | C.will read the | D.read a |
We’ll never forget this terrible accident and the damage_______ has caused to the area.
A.that | B.what | C.it | D.one |
--- You ought to have given them some advice.
--- , but who cared what I asked?
A.I ought to | B.So I ought | C.So it was | D.So I did |