The incomes of skilled workers went up. _____ , unskilled workers saw their earnings fall.
| A．Moreover | B．Therefore | C．Meanwhile | D．Otherwise |
I asked him whether he had done all the work himself ________ whether he had had any assistance.
| A．and | B．but | C．nor | D．or |
I was on the point of going to bed ________ Mr. Zhang rang.
| A．as | B．when | C．while | D．and |
English is understood all over the world ________ Turkey is spoken by only a few people outside Turkey itself.
| A．while | B．when | C．if | D．as |
In this factory, it's hard to tell cadres ____ workers.
| A．from | B．to | C．about | D．in |
My brother is very good ___ ping-pong.
| A．in | B．for | C．at | D．on |