When I was walking past his room yesterday evening, I heard him ________ piano.
This is _____ and we must _____ on it. A hard work; work hard B a hard work; work hard C hard work; hard work D work hard; hard work
I don’t like physics ______ it’s too difficult for me.
—_____ do you _____ the book? —It’s very interesting.
—How ____ can I ____ the books? —Three weeks.
—_____ is it today? —It’s Tuesday.