Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.
| A．while | B．because | C．unless | D．if |
With the loud noise going on in the workshop, I can hardly on my lessons．
| A．put | B．rely | C．concentrate | D．center |
At first, it seemed that everything went well, but all of sudden, the ship hit _________ iceberg．
| A．a; an | B．a; the | C．the; the | D．/; an |
Bob and Tom have nothing in ______ at all ．How can they be good friends ?
| A．total | B．common | C．similar | D．particular |
They all wanted to stop working because they were tired, but of them would say so.
| A．any | B．some | C．none | D．neither |
_________ the flight to New York will be delayed is _________ I’m especially worried about．
| A．If; what | B．Whether; that |
| C．When; that | D．Whether; what |