—Let's paint.

—OK.

s = 0

For a =      To 8 Step 2

  s = s + a

Next a 

若要使语句s = s + a执行3次，则循环变量a初值为（   ）

植物的根尖是植物吸收____ 和____ 的主要部位，它包括四个结构，从最前端开始依次是根冠、____  、伸长区和 ____ 。

    The first way to make friends is to smile. When you smile, people think you are 1 and easy to talk to. It may not be easy at first to smile. But, you can practice in the mirror(镜子). When you look at yourself, think if you'd like to 2to your smiling face or your usual face. Of course the smiling face. Most people stay away from an 3 face.
    One easy way to start a conversation with someone is to say 4nice about them. For example, you could talk about an interesting 5to a teacher's question, good match at the ball field, pretty shirt, etc…. Think about how great you feel when someone says something nice to you. Doesn't it make you want to 6 talking to that person?
    Ask your new friends questions about themselves. Such as: “Who's their favorite singer?” “Where do they live, who's their teacher?” “What do they do after school?” … etc. They are all good questions to start a7.
    When someone asks you a question, do have an answer for them. If you don't8 who your favorite singer is, or what your hobbies are, think about it. There's nothing that will 9a conversation quicker than a shrug(耸肩) for an answer.
     Shy kids often have some trouble with complements. When someone says something nice, shy kids often say nothing. This leaves the other person10 if they said something wrong. The best and easiest reply to a complement is a simple “thank you”.