---________ have you played the piano? ---For four years.
A How often B How long C How much D How many
You worry about me. I’m fine.
A. can’t B. mustn’t C. needn’t
To many foreigners, Guangzhou has become their hometown.
A. two B. second C. the second
Animals are part of nature should be well protected.
A. and B. or C. but
It is not polite to enter others’ rooms knocking on the door.
A. by B. with C. without
In LA Lingling lived with Smiths and got on well with the host family.
A. a B. the C. /