MANY PEOPLE WOULD BE OUT OF WORK IF THAT FACTORY………..DOWN.A. CLOSES...

5. - CAC DANG BAI TAP TRAC NGHIEM TIENG ANH
CAC DANG BAI TAP TRAC NGHIEM TIENG ANH

5. Many people would be out of work if that factory………..down.

a. closes b. had closed c. closed d. would close.