Malaysia Airlines (马航) flight MH370 disappeared from radar (雷达) screens an hour after it took off on March 8.It has 1 for more than 3 months.

    The plane may fall into the sea. China，Malaysia and many other countries have joined to search the 2 on the sea. The relatives of the 227 passengers and 12 crew (乘务人员) are 3 good news from them.

    How did the accident 4？It is said that the plane was attacked (攻击) by the terrorists. Some think there may be something wrong with the plane，and others think the accident may be 5 by the mistake of the crew. However it is 6 to tell the reason because the plane hasn't been found yet.

    It may 7 some time to find the missing plane and even more time to get to know the truth of what happened. However，we can't stop imagining what happened to the plane 8 it is found.

    Whether the missing plane is found 9 not，the whole world should pay more attention to the safety of people，especially at airports.

    We hope these people on the plane will be 10，and they can get together with their family members.

下列物质：①硫；②铁；③碳；④蜡烛．它们在氧气中燃烧（用相应的序号填空）：发出明亮的蓝紫色火焰的是　 ____；产生带刺激性气味的气体是　 ____；能生成黑色固体的是　 ____；只产生无色无味的气体并能使澄清石灰变浑浊的是　 ____；发出白光，放出热量，在瓶壁上有水雾出现的是 ____

    To breed snails (蜗牛) well, you need to spray water to the container every morning and evening, change soil every two weeks, and feed them with cabbages and sweet fruits—this is what Sun Youxiang, a fourth-grade primary school student in Hangzhou____(conclude) after breeding snails for one year.

    From three small white snails at the very beginning____more than 60 snails of four generations now, he has done a great job in his assignment for his science class____(witness) the reproduction of animals is a precious experience for kids. Their____(create), patience, and respect for life will be stimulated (激发) as they learn to take care of animals on their own.

    Sun's teacher said the assignment served as a good example of life education. Practice____(be) an essential step in leaning, which will benefit the kids for____life time. Life education allows kids to know how to live with nature and creatures in a friendly way.

    Starting from this year, Science will become an____ (equal) important subject as Chinese and Math in primary schools____aims to improve students' knowledge about the surroundings____(draw) by curiosity, more kids will be willing to observe and think through practicing, which will add to____(they) recognition of the world in the long run.