21. Ⅶ took off on November 1st, 2011, at Jiuquan Satellite Launch Center in Northwest China. spacecraft Shenzhou
A. The; the B. The; / C. A; the D. A; /
22. This job is great salary. However, it has several disadvantage, such as long working hours and inconvenient working place.
A. on behalf of B. in addition to C. thanks to D. in terms of
