根据所给首字母或单词提示, 写出正确的单词完成短文。

    April Fool's Day is on April 1st. People can play j____ on others on this special day. A____ doing this, you usually laugh and say: “April Fool”.

    Mother's Day is on the second Sunday of May. It's a day to t____ mothers. Many people give cards, f____ or other treats to their mothers. Some schools help their s____ to make a card for their mothers. On the cards,children will w____ “Thanks, mother”, “Best w____ for Mother's Day” and so on.

    Thanksgiving Day is on the fourth T____ in November. It's a day when people thanks for the g____ things in life. Usually families all get t____ and have a big dinner.

1973年，阿拉伯国家宣布对西方国家实行石油禁运，这次禁运的影响有(  )

①引发了西方国家的经济危机 ②显示了产油国联合斗争的巨大威力 ③对世界经济和国际政治产生了深远影响 ④直接促成了埃及和以色列建交

通过长期探索人类于17世纪发现了万有引力定律，该定律是由哪位科学家总结得出的（     ）

小青在实验室发现一瓶长期敞口放置的浓盐酸，为方便以后使用，他对其浓度进行了测定。取10克此盐酸于烧杯中，逐滴滴加溶质质量分数为4％的氢氧化钠溶液，用pH计(一种测定溶液pH的仪器)测定溶液的pH，得到数据如下表所示：