Wait for me at home if you ______ back before I do. [ ]

Mandy is ________ the school football team.[ ]

A study shows that a tropical fish in America can survive (存活) _____ water for up to 66 hours. [ ]

Are you going to Beijing by ______ train?－No. I’m taking ______ car.

Try again, maybe you will come up with a better idea.