Since David ________ downloaded a virus into his computer，he can not open the file now[ ]

I think your advice is of great ________ tome and it’s _______.

Occasions are quite rare ____ I have thetime to spend a day with my kids.

Those who suffer from hearttrouble will find they get _______ from this medicine

Why would some workers in Foxcon die__________ continue working in the factory —Psychologists say they are under toomuch pressure.