Coughing _____ also be used for social reasons, such as the coughing before giving a speech．
A．may B．should C．must D．need
Production of less expensive car brands like Chery and BYD means more Chinese can ______ cars．
A．recover B．afford C．maintain D．produce
—Jenny, did you see the manager ______?
—If I had been there 5 minutes earlier, I would have met him．
A．itself B．him C．herself D．himself
In the US they focus on creative thinking skills, _____ in China they only focus on theory．
A．since B．when C．while D．now that
The Yangtze River, China's longest, has been affected by a severe drought, _____ the lowest level of rainfall this year since 1961．
A．with B．for C．beyond D．besides
As ______ child, Salk did not show any interest in ______ medicine or science in general．
A．不填; 不填 B．the; 不填
C．a; 不填 D．a; the
