Some people find the film Avatar difficult______.

By the year 1889, there were just 541 bison ________ in the whole of North America.

That boy spent much time _____ computer games.
A play       B playing        C played         D to play

You can hardly imagine Tom _____ the boy so cruelly (残暴地)
A to treat       B to be treated       C being treated        D treating

Our teacher said that the newspaper, the 21st Century, was worth _____.
A reading        B being read         C to read        D to be read

Sandy could do nothing but _____ to his teacher that he was wrong.

The whole hall wants ______.

______ worried her mother a lot.

_____ with terror, the dog hid himself in a small cave, _____ his tail to the rain.

The father stayed up late, ______ a long letter to his son.