Several companies are__________ each other__________ a contract（合约）.[ ]

This article may shock some sensitive readers, _____I offer my apologies in advance.

You cannot be more careful when crossingthe street, or you may ___ by cars.

Sometimes people move their shoulders upwards away from their upper body and then let them fall, _____“I don’t know”.

I won’t go to her party unless my best friend Jack ________.