Ⅰ.单句语法填空(block) several rivers here.

　　②Large quantities of information, as well as some timely help have_been_offered (offer) since the organization was built.

　　Ⅱ.完成句子如果你大量购买会便宜得多。雨水把大量的泥沙冲下山坡。5．observe　观察；观测；遵守；庆祝[高考佳句](2015·陕西高考阅读D)Other forms of parental involvement, observing a child's class, also fail to help ...

　　其他的家长参与形式其中包括在学校做志愿者并观察孩子的上课情况也未能起作用……(1)observe sb. do sth.　观察某人做某事(全过程)观察某人正在做某事观察……(2)observe the traffic rules

　　遵守交通规则过圣诞节When I passed his house, I observed him playing in his yard.

　　当我经过他家时我注意到他正在院子里玩耍。She observed that all the chairs were already occupied.

　　她发现所有Do observe the traffic rules whenever you cross the road.

　　不管什么时候过马路一定要遵守交通规则。[名师指津]　observe sb. do sth. 在变成被动语态时应添加省略的不定式符号“to”。The thief was observed to open the window and run away.

　　有人发现窃贼开窗户逃跑了。

　　Ⅰ.写出句中observe的含义observe (庆祝)

　　National Day, observe (遵守)

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