The mobile phone has influenced people’s life a lotsince it .

How tall the boy is! —Yes, he is taller than __________ in his class .

The two girls are so alike that strangers find_____difficult to tell one from the other.

It is generous ______ you to help me so much.— My pleasure. A friend in need is a friend indeed.

The book has been translated into thirty languagessince it ______ on the market in 1973.