It is reported that between the year 1550 and 1950 about one kind of living things___each year .
| A．died out | B．died of | C．died from | D．died down |
______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 |
Medical ________shows that men are more likely to have heart attacks than women .
| A．evidence | B．entrance | C．identity | D．receptin |
We sat in the bombshelter listening to the enemy shells _________.
| A．sinking | B．exploding | C．designin g | D．ruining |