补全单词，并与相应的汉语意思用线连起来。（10*1=10） 
( ) Look ________ the blackboard!
A. at B. / C. to
() --- _________ is it?
---It’s red.
A. What B. Where C. What colour
( ) How many ________ do you have?
A. math books B. math book C. a math book
() Let ______ clean the board.
A. me B. my C. I
( )Mike: Nice to meet you.
John: _____________________.
A. Nice to meet you, too. B. Good morning. C. Hi