The further falling of the stock market as reported today has ________ a fresh wave of selling.
A．given off B．set off C．put off D．got off
I'm interested in a single room. Do you have any ________？
A．convenient B．available C．possible D．personal
I ________ on a sofa because my grandparents have been here to spend the weekend.
A. slept B. was sleeping C. have slept D. am sleeping
The Voice of China has set up a stage some people can achieve their dreams．
A．which B．where C．that D．when
---I will have to think about it again．
--- If you _ , you may lose the opportunity to compete altogether．
A．hesitate B．wonder C．continue D．fail
Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
A. the; a B. a; a C. /; a D. /; the
