The first few years in the 21st century ______ the rapid rise of China as a world economic power.
| A．witness | B．has witnessed | C．will witness | D．have witnessed |
As we all know, the beautiful mobile isn’t _____ high price at all.
| A．worthy too | B．worth that | C．fit much | D．valuable that |
_____ environmental damage is done does it take many years for the ecosystem to recover.
| A．Even if | B．While | C．Only if | D．Once |
The student’s mind is always _____ when he listens to his teacher.
| A．wondering | B．wandering | C．wondered | D．wandered |
—Do you know who the young man is beside the door?
—A man _____ himself Jason.
| A．called | B．calls | C．calling | D．being called |
—Why did your team lose the game?
—They had a big advantage _____ us —— _____ so much taller.
| A．above; are | B．over; being | C．of; were | D．than; being |