It was not until the beginning of the twentieth century________to explore space.
A．did man begin B．when man began
C．that man began D．then man began
A notice was________in order to remind the students of the changed lecture time.
A．sent up B．given up
C．set up D．put up
It took________supplies to construct these energysaving houses. It took brain too.
A．other than B．more than
C．rather than D．less than
Since you weren’t at the meeting, we the decision without you.
A. made B. had made C. were making D. would make
Internet shopping will ready when people make sure that it is safe.
A. take off B. take up C. take over D. take on[
Many difficulties have as a result of the change over to a new type of fuel.
A. risen B. raised C. arisen D. arrived
