The students asked ____.

Now teachers tend to be more dependent on ________ is thought to be a great teaching­aid — the computer.

What do you think of the music teacher?- she is an elegant lady, she can be extremely difficult to work with

The last decade of the 21st century ________ the rapid, steady development of China in various fields

Not until he promised to return it to me as soon aspossible ____ my electronic dictionary to my classmate