根据对话内容，从方框内选出能填入空白处的最佳选项，其中有两项为多余选项。

A: Look at that strange thing, Wei Hua! What’s that?

B: It’s a key. 1.? ?????????

A: Our autobike (电动自行车)? 2.?

B: It was invented by my father. It’s a battery-operated（电池驱动的）machine.

A: ? 3.?

B: It’s used for riding or flying.

A: Flying? __4.____

B: You can just ride it like a autobike and it will fly as it goes faster enough.

A: ___5.___ I think your father is so great!

B: I think so. He has invented many things.

— Excuse me. What's the _________ usually used for?
—It's used for protecting people from the rain.
A. raincoat                B. mirror              C. shelf

— Excuse me. What's the _________ usually used for?

—It's used for protecting people from the rain.

A. raincoat                B. mirror              C. shelf

—Excuse me, what’s the_________usually used for?

   --It’s used for protecting people from the rain.

A. raincoat.         B. shelf              C. airplane          D. soldier

A：I'm afraid I've lost my coat.

B：Is this yours? It's 1 of cotton.

A：No, this is not my coat. It's Miss Turner's. 2 is made of cotton.

B：Is that your coat? It's made of wool.

A：No, it's not mine, 3 .

B： 4 is your coat made of?

A：Mine is made of paper, a kind of strong paper. It's a new invention.

B：A paper coat! What's it used for?

A：It's used for 5 off rain.