27.How long do you think it will be________China becomes a rich and harmonious country?
| A．before | B．after | C．since | D．When |
The chief editor expressed his doubt _______senior people would enjoy reading such magazines .
| A．which | B．how | C．whether | D．that |
As your instructor advised ,you ought to spend your time on something ______researching into .
| A．precious | B．worth | C．worthy | D．valuable |
Fancy Williams not ______the answer to such an easy question ！
| A．know | B．to know | C．knowing | D．knew |
______letting go of a god chance like that ,the silly girl .!
| A．Fancy | B．Suspect | C．Suppose | D．Wonder |
Thes chemical ,_______to kill biological organisms ,are unsafe and oten not specific in their targets .
| A．having designed | B．to design | C．designing | D．designed |