People think “SOS” is the simplest and common to make, in time of danger or disaster.
| A．mark | B．sign | C．signal | D．remark |
He seems to be doing nothing, but _____ he is just waiting for his chance.
| A．actually | B．gradually | C．frequently | D．certainly |
The boss requested that he _____ there to work.
| A．was sent | B．be sent |
| C．should send | D．would be sent |
You must ______ your papers before you hand them in.
| A．go down | B．go across | C．go out | D．go through |
Did you have any difficulty _____ his house?
| A．on finding | B．to finding |
| C．for finding | D．in finding |
Have you ______some new ideas？
| A．come about | B．come into |
| C．come up with | D．come out with |