Scientists ______ thousands of chemicals before they decided on the right one in the end.
| A．tried out | B．found out |
| C．worked out | D．turned out |
—Shall he come today or tomorrow?
—Up to him．It makes no to me．
| A．meaning | B．trouble | C．relation | D．difference |
—I am afraid the manager can’t see you until 5 o’clock.
—Oh, _____ I won’t wait.
| A．no doubt | B．after all | C．in that case | D．in this way |
To a small and faraway town like this, a car accident is always considered ______ interest, so people soon gathered around.
| A．as | B．of | C．by | D．In |
There is no decision yet ______ when the work might start.
| A．due to | B．as to | C．in addition to | D．owing to |
The days when he was_________ his best is already a thing of the past.
| A．in | B．on | C．at | D．with |