________ thousands of Chinese students，Chuck has vast experience in the Chinese class.
| A．Having taught | B．Taught |
| C．Teaching | D．To have taught |
. It is generally considered unwise to give a child _____ he or she wants.
| A．however | B．whatever | C．whichever | D．wherever |
The ____ tall pole cast a ____ long shadow.
| A．ten feet; twenty feet | B．ten feet; twenty-foot |
| C．ten-foot; twenty-foot | D．ten-foot; twenty-feet |
_____ from the past performance, he is not likely to do very well in his exam.
| A．Judging | B．Judged | C．To judge | D．Having judged |
The two leaders have _____ the foundations of a new era in cooperation between their countires.
| A．laid | B．lied | C．lain | D．set |
Rainforests___________and burned at such a speed that they will disappear from the earth in the near future.
| A．cut | B．are cut | C．are being cut | D．had been cut |