Chest pains can be a warning ____of heart problems.
| A．signal | B．sign | C．mark | D．symbol |
----Have you seen＿＿＿＿pen﹖I left it here this morning.
-----Is it＿＿＿＿black one﹖I think I saw it somewhere.
| A．a；the | B．the；the | C．the；a | D．a；a |
The news has spread all over the country ____ the spaceship succeeded in returning to the earth.
| A．which | B．that | C．whether | D．what |
____ he works hard, I don’t mind when he finishes the experiment.
| A．As soon as | B．Even though | C．So long as | D．So far as |
____, he does not know the answer.
| A．As he is a teacher | B．As he is teacher |
| C．A teacher as he is | D．Teacher as he is |
We were ____ to go out for a camp ____ it began to rain.
| A．hardly; than | B．around; as | C．about; when | D．nearly; while |