The hall is too noisy. The speaker has to raise his voice to make himself _____. A.hear B.heard C. hearing
______ book on the desk is _____ useful one.
–How many _____ are there in your school, Tom? -- Two.
He made up his mind to devote his life pollution happily.
When I am a bad mood, I like wearing orange to .
— Could you tell me ______? I must find him. — Sorry. I have no idea. But he was here just now.