——Now lots of teenagers spend a lot of time playing computer games. ——Yes. Teachers and their parents should prevent them ______________ too much.

Tina went into the kitchen       her mother make dumplings.

I’m looking forward to _________ Beijing.This summer holiday my family are going to_____ the Oympic Sports Center.

When we came to the gate, he stopped _______ me go in first. 

 If you don’t study English all the time, you’ll have a difficult time ____ it in the future.