Mary had to go to a meeting, so she left her children________at home.[ ]

We are not prepared to compromise _____ theprice of the computer

Have you ever been to ShanghaiYes. I there with my father last year.

Her sister can play _______ piano， but she can’t play _______ chess.

The engine of the bus was _________,and the bad weather added to the worries of the passengers.[ ]