Mike pretended _____ his homework when mother came.[ ]

It is safe to eat chicken that________fully, but most people still dare not do that because of the H7N9bird flu .

She was moving out of her old apartment _______ she suddenly realized that the key to the new apartment wasn’t on her

I’ll be out for some time______ anything important happens, call me up immediately

I didn’t have _____ to say, so I said _____.