Taking this medicine，if________，will of course do good to his health.
| A．continued | B．to continue |
| C．continues | D．continuing |
______ I can know, there is no better way to keep away from the danger.
| A．As long as | B．As far as | C．Just as | D．Even if |
He said he would work it out himself, ________ ask nobody for help.
| A．and not to | B．but not | C．and prefer not | D．rather than |
They were swimming in the river ______ suddenly the storm started.
| A．when | B．while | C．until | D．before |
________ a difficult situation, so you should send a message to him and give some advice to him .
| A．As he is in | B．He is in | C．Being in | D．He being in |
It was dark______ we arrived at the little town .
| A．that | B．until | C．since | D．before |