1.Mydad’shairfell____________whenhewasonly30.

2.What____________(count) isthatallthosetrappedinthebuildinghavebeenrescued.

3.Leftuntreated£¬highbloodpressuremayleadtoheartattack£¬strokeandkidneyorheart____________(fail).

4.Ifhehadfollowedthedoctors'advice£¬he____________(recover).

5.Heisaboywithlittlepowerof____________(concentrate).

6.Consumersalsohavetoworryabouttheeffectsofpollution____________foodproduction.