_____ the chapter four times, I finally understood the author's theory.
A.Reading | B.Having read | C.To read | D.Read |
It is well understood _____ controls the flow of carbon dioxide in and out the atmosphere today.
A.that | B.when | C.what | D.how |
–How far apart do they live?
–_____ I know, they live in the same neighborhood.
A.As long as | B.As far as | C.As well as | D.As often as |
He was about to tell me the secret _____ someone patted him on the shoulder.
A.as | B.until | C.while | D.when |
He’s got himself into a dangerous situation _____ he is likely to lose control over the plane.
A.where | B.which | C.while | D.why |
I have waited for her since _____.
A.two hours ago | B.two hours before |
C.two hours | D.two hour’s time |