Yesterday Mr. Wang told us the earth always ____ around the sun.

where did you guys go for the summer vacation—-We________ busy with our workfor months, so we went to the beach to relax ourselves

I am afraid he’s more of a talker than a doer, which is ________ he never finishes anything.(2011·山东)

I know only a little about thismatter; you may ask ____ knows better than I

Cocaine’s being often used as painkillers can give rise to the________belief that it is not an addictive drug.[ ]