马路上的路灯总是一齐亮，一齐灭．如果它们其中一盏灯的灯丝断了，其它灯仍能正常发光．根据这些现象判断路灯是

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我又不干错事，怕什么（    ）？你们买了许多奴隶，把他们当作驴狗骡马一样看待，叫他们做种种（    ）的工作，因为他们是你们出钱买来的。我可不可以对你们说，让他们（    ），叫他们跟你们的子女结婚？为什么他们要在重担之下流着（    ）？

如图，在一次军事演习中，蓝方在一条东西走向的公路上的A处朝正南方向撤退，红方在公路上的B处沿南偏西60°方向前进实施拦截，红方行驶1000米到达C处后，因前方无法通行，红方决定调整方向，再朝南偏西45°方向前进了相同的距离，刚好在D处成功拦截蓝方，求拦截点D处到公路的距离（结果不取近似值）

    In Western countries, many children do chores to get pocket money. 1 usually start to do this at the age of 10.

    School students have to do homework and study 2 tests on weekdays. So they often do chores on 3. Some young kids only do 4 chores. So they don't get much money. But that's all right. Many of them only want to 5 candies. And candies are cheap！They help wash the dishes after dinner, and 6 the family cat or dog.

    When kids get 7，they want to buy more and more things. They want things that are more expensive than candies. Then they have to work harder！They often 8 the family car, cut the grass, walk the dog or cook dinner.

    Doing chores is a good 9 for kids to learn new things. For example, they can learn how to use a lawn mower(割草机) or 10 to cook. Of course, their parents help them at first.