已知X元素的氧化物的化学式为X₂O₃，则X的氯化物的化学式为　____ ，X与硫酸根结合的化合物的化学式为____ 　（X元素的化合价不变）．

阅读下面短文,从短文后各题所给的四个选项(A,B,C和D)中,选出可以填入空白处的最佳选项。

    Smith, an old man, lived in the middle of the town. One day he found his watch1in his own store. It 2a lot to him because it was from his wife. After searching3in the store for a long while, he 4to ask for help from a group of children playing outside the store. He5them that the person who found it would be rewarded. 6this, the children hurried inside the store, went through and around the 7store, but still could not find the watch.

    Soon the man felt hopeless and wanted to8. A little boy went up to him and asked for another9 . The man looked at him and thought, “ Why not? 10, this kid looks sincere enough.”11the man sent him back in the store. After a while the boy 12 with the watch in his hand! The man was very13, and he asked the boy how he found it while the others had 14 . The boy replied, “I did nothing but sat on the ground and 15 .Then I heard the ticking (嘀嗒声) of the watch and just looked for it in that 16.”

    We usually do something in a hurry and don't think about our own needs, which can't bring peace into our mind. 17 we need to think about ourselves and keep peaceful for a while, which can produce a 18 result. So allow a few minutes of 19 to your mind every day, and see how it helps you deal with your work and make 20as you expect to!

明朝时流传一首民谣：“天皇皇，地皇皇，莫惊我家小儿郎；倭寇来，不要慌，我有戚爷会抵挡。”当时，除了倭寇还有哪些国家对我国进行了侵犯（ ）

把下面的词语连成一个通顺的句子。

①远在国外的    我    一个   发了   给   贺卡   表姐   试着

②远古   植物   时代的   地层底下   煤炭   变成的   是由   埋在