-- _____is that used for?---_____ the floor.
Why so many youths are _____ on playing computer games often puzzles us a lot.
_________ I picked up the receiver, I realized that someone had dialed the wrong number.
.— Thank you for your CD-ROM.I’ll return it as soon as I can.—_________.I’ve got another one to spare.
.In this university a medal with ten thousand dollars_________gains success in science and technology every two years.
.If the launch is successful this year,China will be the third country_________its astronauts into space.