The children ______ not to play with the fire.

Usually before exams, the students ____two minutes to write down their names.

---Please say“I’m here．”when your name _________.---Yes，Mr Smith．

 The 30th London Olympic Games ____________ on July 27th, 2012.

—It’s difficult for the village children to cross the river to get to school. We think a bridge_______over the river.