While crossing the street, you must _______ your riding speed.

I found it quite necessary ______ a foreign language.

______ in Shanghai for more than ten years, he know  the city very well.

_______ round the city, we were impressed by the city’s new look.

Parents often have their children_____ little housework so that they can have more time______.

If you go to the souvenir shops in places of interest, sometimes you can’t help ________ into buying something fake.

The well was found __________ when we got there.

All the staff in our company are considering ___ to the city center for the fashion show.

We made use of every minute ______ for the coming examination.

When first____ to the market, these products enjoyed great success.