Isn’t that your teacher over there? —No, it ______ be him. I’m sure he doesn’t wear glasses.

MrWang is a man of few words,but quick in mind—____,you know 

Doing sports ______ me keep fit.

Imperfect goods are________by our quality controlcenter in case they come into the consuming of the customers.

___when we came here last time, which was saidto date back to 773 BC