A study shows that the more teenagers watch actors smoking in films, the more likely they are ________ the habit of smoking.

Playing with fire can be very dangerous, or _____ it another way, don’t try it like this. [ ]

There is garden in _______ centre of our city.

TheShanghai World Expo ________ a large number of tourists from abroad. [ ]

I rang you several times yesterday, but couldn’t ________.—I’m sorry but my phone didn’t work.