At______ time does the salesgirl get up late in the morning.She is too busy to take a good rest.

—How long are you staying there?—_________depends.

Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.

A chair made of steel is stronger, though costs much more, than _____  made of wood.

–Let’s go to the cinema by taxi.-Don’t worry, we have __________ time.