— Excuse me, this bag is too heavy. ________  

— Of course.

选出不同类的单词。

①____ A.pen        B. pencil      C. ruler      D. banana

②____ A.apple      B. pear        C. chair      D. orange

③____ A.window     B. door        C. it         D. blackboard

④____ A.look       B. here        C. clean      D. close

⑤____ A.how        B. dad         C. mum        D.sister

There is a clock.

有人说:“如果瓦特早出生一百年，他和他的发明将会一起死亡!”这说明瓦特的发明能够问世并使人类进入“蒸汽时代”，最主要的因素是（   ）

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

    One morning，I was waiting at the bus stop，worried about____  (be) late for school.

    There were many people waiting there， ____   some of them looked very anxious and____ (disappoint)．When the bus finally came，we all hurried on board.I got a place next____ the window，so I had a good view of the sidewalk.A boy on a bike____ (catch) my attention.He was riding beside the bus and waving his arms.I heard a passenger behind me shouting to the driver，but he refused____  (stop) until we reached the next stop.Still，the boy kept____  (ride)．He was carrying something over his shoulder and shouting.Finally，when we came to the next stop，the boy ran up to the door of the bus.I heard an exciting conversation.Then the driver stood up and asked，“____  anyone lose a suitcase at the last stop？”A woman on the bus shouted，“Oh，dear！It's ____ ．”She pushed her ways to the driver and took the suitcase thankfully.Everyone on the bus began talking about what the boy had done，and the crowd of strangers____ (sudden) became friendly to one another.