Paper money was in_______use in China when Marco Polo visited the country in________thirteenth century.
| A．the;x | B．the;the | C．x;the | D．x;x |
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 |
It was reported that of the six people injured in the crash ,only two _______.
| A．ignored | B．recognized | C．buried | D．survived |