2×2-1＝____

2×2+1＝____

2×2+2＝____

假如你叫Sandy，学校将组织一次去敬老院的公益活动，你很想参加此次活动。请根据下面提供的信息，用英文给Mr. Smith写一封简短的自荐信。

要求:1.意思连贯，书写规范，要点齐全，注意格式。2.词数80词左右，开头和结尾已给出，不计入总词数。3.不要出现真实的人名和校名.

Dear Mr. Smith,

    I'm writing to recommend myself to take part in the activity to the old people's home.

请将内容写在答题卷指定              

    I think I have all the qualities of being a good volunteer. I'm looking forward to your reply.

Yours sincerely,

Sandy

秒表读数为____ s.

I'm afraid ____ out alone at night.