Many scientists believe that global warming , if , will cause extreme climate changes this century .
| A．not stopping | B．no stop | C．not stopped | D．without stop ycy |
Steve Jobs, the former CEO of Apple Computer, passed awayOctober,2011.
| A．at | B．in | C．on | D．by |
Happy times usually pass quickly without.
| A．noticing | B．being noticed | C．having noticed | D．to be noticed |
---, but are you forgetting something?
--- Oh, my God. We haven’t fix our next meeting yet.
| A．I’m sure | B．I’m afraid so | C．Take care | D．Excuse me |
food is hard to find, few birds remain throughout the year.
| A．Although | B．Where | C．Unless | D．When |
The boss________company I worked in two years ago has________in solving such kind of problem.
| A．whose; many experiences | B．who; many experiences |
| C．whose; much experience | D．which; much experience |