Can you imagine that a smart man likehim_____ make such a stupid mistake

The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.

Internet shopping will ready when people make sure that it is safe.

Do you like game shows— No, I don’t. They’re________

28．—Surely you can turn to David for help．—__________He is the last one you candepend on．