14．After a short rest, he came back to he had stopped and continued reading.
| A．where | B．which | C．in which | D．that |
No sooner had we reached the top of the hill _____ we all sat down to rest.
| A．when | B．then | C．than | D．until |
I can think of many cases _____ students obviously knew a lot of English words and expressions but couldn’t write a good essay.
| A．why | B．which | C．as | D．where |
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 |