For a moment nothing happened. Then 　　　　 all shouting together.

You could hear water pipes cracking _____ they _____ because of the cold[ ]

Can we go camping tomorrow，as planned—I’m afraid not The dark clouds aheavy rain

Look at ______ book on the desk . Is it ______useful one –Yes, it is . In the book there is much advice on howto learn math well.

Don’t forget to ______ the lights and the TV in the sitting room before going to bed.