The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally.
| A．will function | B．functioned | C．is functioning | D．has functioned |
We are working under the command of the manager that no _______ be spared to make the party a success.
| A．trouble | B．expedition | C．expense | D．experience |
For sustainable development, the government has decided to give __________ to those energy conserving and environmental-- friendly business in many aspects.
| A．profit | B．interest | C．advantage | D．preference |
I counted the people the activity, and there were 286 of them.
| A．were taking part in | B．taking part in |
| C．taken part in | D．took part in |
They had kept working for several weeks everything was in order.
| A．before | B．after | C．since | D．unless |
The headmaster who had the grand ceremony waved to the crowds with a smile .
| A．included | B．joined | C．introduced | D．attended |