根据情景内容，在空白处填入合适的单词。
A: Mike, could you do me a favor?
B:Fine. (1) can I do for you?
A: Take out the rubbish, please.
B:No (2). But where should I take it?
A: To the rubbish bins around the street corner.
B: OK. I'll go at once!
A:Don't forget to put it in the right bin.
B: How many bins are(3)?
A: There are four.
B! But (4) can I know which is the right one?
A: It's easy to tell. They have different colors and signs.
B:OK.I (5)