Ladies and gentlemen, please fasten your seat belts．The plane ________．
| A．takes off | B．is taking off | C．has taken off | D．took off |
Chinese scientists ______ on Tuesday that they ______ a low-cost welding robot, which can help improve welding efficiency for small factories.
| A．announces; had invented | B．announced; have invented |
| C．announced; had invented | D．announces; have invented |
It is difficult to hire young people to work as a bricklayer or carpenter nowadays, because they usually think the job, which requires hard work and is dirty most of the time, is ______.
| A．unbelievable | B．unique |
| C．unwilling | D．unacceptable |
Chenshu seems to be the happiest woman on the planet, with a healthy work-life balance, ______ Chinese-Australian pianist Zhao Yinyin in 2009.
| A．married | B．marrying |
| C．having married | D．had married |
A love marriage, however, does not necessarily ______ much sharing of interests and responsibilities.
| A．take over | B．result in |
| C．hold on | D．keep to |
The middle and high school period is a special one for children, a transition from children to adult, ______ children tend to be rebellious.
| A．when | B．where | C．that | D．of which |