Don’t leave your keys in the car. Someone might steal ________ 。

In American there are more households(户主) with pets than ____ with children.

----Have you seen Tom and Mary?----I haven’t seen____ of them. 

---Have you got used to your school life here? ---Yes, but I don’t like _______ when we have to do exercise on cold winter mornings.

 Both teams were in hard training, _______ was willing to lose the game.