downloading of large numbers of apps is one of the most risky behaviors someone with a smartphone can engage in.
| A．Cautious | B．Public | C．Random | D．General |
It has always been the _____ of our firm to encourage workers to take part in social activities.
| A．plan | B．campaign | C．procedure | D．policy |
The most important _____ of his speech was that we should all work whole-heartedly for the people.
| A．element | B．spot | C．sense | D．point |
When I worked as the general manager of the firm, I sometimes had _____ to visit London on business.
| A．opportunity | B．possibility | C．occasion | D．chance |
As civilization______, more and more people have realized the importance of preserving rare animals from extinction.
| A．stretches | B．spreads | C．extends | D．expands |
Although I had read the book assigned by the professor several times, it didn’t make any______ to me.
| A．meaning | B．importance | C．sense | D．significance |