读课文《守株待兔》回答

“种田人丢下锄头，整天坐在树桩旁边等着。”这个句子中“整天”是说种田人一天到晚地等着，可见他十分____。去掉这个词以后，种田人什么时候坐在树桩旁等着就不清楚了。

在△ABC中，∠C=90°，∠B=50°，AB=10，则BC的长为（　　）

先阅读短文，然后根据短文内容从方框内所给的单词中选择最恰当的词（注意词形变化）填入短文空白处，使短文完整、通顺。一词只用一次，一空限填一词。方框中有两个词是多余的。

     Now lots of parents will buy everything that their children want to have. If they go on with the habit , their children won't know the money ____from hard work .
    Some parents like to____birthday parties for their children . If they keep on doing this , their children will think it____ for them to enjoy birthday parties every year . Year after year , maybe they will forget their ____birthdays and only remember their own . It is against traditional habits.
    Many parents don't let the children do ____. They think children have only one thing to do. They should study hard and do____in their lessons . If parents go on doing like this, the children will only learn to open their mouths to be fed and stretch out (伸出) their arms to be ____every day . When the children grow up , they will be able to do ____ and they won't even find a____. Parents should teach the children ____to do housework because it can ____ them start good habits of working by themselves.

饮水中添加含钙、镁、锌、硒的矿物质，可改善人体营养，增强体质，其中“钙、镁、锌、硒”是指（   ）