There are some birds singing ___ the trees.[ ]

Susan’s parents bought a large house with a swimming pool. It ______be very expensive.

Peter speaks Chinese well indeed，but of Course not ______a local speaker in China．

I think it’s going to be an argument.（争论）—Yes, it could be.—I wonder ______we can do .

Tom likes doing things with his family. He’s learned much from ___ His family help him a lot.