Many scientists believe that global warming, if , will cause extreme climate changes this century.
. I can’t receive your phone call at 8 o’clock tomorrow, because I ____ the meeting. A am attending B will attend C will be attending D am to attend
Tom first met Lucy three years ago. She ____ as a teacher in a high school. A has worked B was working C is working D had worked
The young lady stopped and looked around as if_____ whether she was being followed. A seeing B to have seen C having seen D to see
--- Remember, Dad, Thomas Edison got bad grades in school, too. --- Stay in your room until you’ve _____ the electric lamp.A invented B discovered C made D imagined
There isn’t much time_____ . shall we go now? A leaving B to leave C being left D left