-- _____is that used for?---_____ the floor.
An increasing number of countries have been ________ China as a threatening power recently.
All the citizens here strongly insist those found ________ “harmful” advertisement in the streets ________ punished strictly.
Scientists are convinced ________ the positive effect of laughter ________ physical and mental health.
--May I speak to your manager at four o’clock this afternoon?--I’m sorry. He ________ to a conference long before then.
--Do you need any help, Lucy?--Yes. The job is ________ I could do myself.