-- _____is that used for?---_____ the floor.
It is required that the students ______ mobile phones in their school, so seldom ______ them using one.
I tried to call on you last week but your dog simply ___ not let me through the gate.
Dr. Frank failed many times but he finally ______ to find a successful way to solve the problem.
--Do you really want to go out? --It may rain._____, I shall go out; I don't mind the rain.
--When shall we meet to discuss the project? --Anytime you feel like ______.