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The Internet has become increasingly popular, ______ us to see as well as to hear all kinds of programmes. 

With a lot of difficult problems _    , the manager felt like a cat on hot bricks.

—Who is the man ______ by a group of students there?
—A professor _____ research on physics.

    from the top of the tower ,the south foot of the mountain is a sea of trees.

_____ an important decision more on emotion than on reason, you will regret it sooner or later.

Exciting as its special effects are ________, there is too much violence in the film.

Experts say ________ to sunlight for too much time will do harm to one’s skin.

Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it.

____, I had to buy a new one.

Under the environment of fierce competition, the only way John could imagine _______ stress was to get tougher by making greater efforts.