The earth（地球） is our home, and we must _____ it clean.
—Where ____ they from?—They’re from China.A. is B. am C. are
当别人帮助了你, 你应该说 ____A. OK. B. Nice to meet you. C. Thank you.
下列字母书写格式正确的是 ____。A. B. C.
下列各组字母中全部是元音字母的是 ____。A. a, e, o, r B. a, i, u, e C. o, u, e, n
—____ you Mingming?—Yes, I ____.A. Are; are B. Am; am C. Are; am
B.
C. 
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