When asked what they would volunteer to do, ________ said they were willing to do something they could.
A．half of these B．half of which
C．half of whom D．half of them
With ________ successful launch of the first space lab module Tiangong-1, China’s space dream has taken ________ step closer to reality.
A．the; a B．不填; a C．a; the D．the; 不填
Alice received an invitation from her boss, ________ came as a surprise.
A．it B．that C．which D．he
Most people find it hard to ________Beijing Opera to foreigners because of cultural differences.
A．get across B．get over C．come across D．come over
At the age of fifteen she gave up taking piano lessons to _____ her school work.
A．hold on B．call on C．put on D．concentrate on
It is still under discussion _________ the old bus station should be replaced with a modern hotel or not.
A．whether B．when C．which D．where
