____ advertisements, TV programs are often made boring.
The thought of going back home was _______ kept him happy while he was working abroad.
Although medical science __________ control over several diseases,what worries us is that some of them are returning.
---What happened to the house ? ---It _____burnt to the ground.A is said to having been B. is supposed to have beenC is reported to have been D. is believed to have
---You must obey every word of mine! ---_______ I don’t?
How long do you think it will be _______ China sends another manned spaceship to the moon?