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Step 2
Complete the word map with the words and expressions in the box.
Step 3
Fill in the blanks with the correct form of the words in brackets.
The earth and seven other _______(planet)go around the sun.____(none) of the seven other planets has an ___________ (e) like that of the earth. The sun and its planets are called the ____________(solar system). There are billions of stars in the Galaxy, and the sun is only one of them. Scientists have __________(发现) many other galaxies in the ________(宇宙).It's ___________ (不可能的) to imagine how large the universe is. Scientists have sent __________(spaceship) to the planet Mars. But no one has travelled far enough __________(reach) other stars in our Galaxy. But, why has no one from other planets _______________
(communicate) with us? No one knows the answer.
Step 4
Distinguish these words
辨析discover find 与 look for
1.Columbus __________ America but he did not explore the new continent.
2.I am _____________ a job, but it seems a little difficult for me.
3.Have you _______ your phone?
辨析late 与 latest
1.After getting up in the morning, my mother
is used to reading the ___ newspaper.
A late B lately C latest
2. He got up __.
A late B lately C latest
辨析no one 与 none
1.____ of the reasons was true. You're lying.
A None B No one C All
2.-- Who will go with Mr Wang?
--____. They are all busy this week.
A None B No one C Some one
辨析already yet just ever
在现在完成时的句子中，already(已经)、just(刚刚)常用于肯定句.already, never, ever, just 一般置于助动词have/has之后，过去分词之前。
yet(还、尚、仍然)常用于否定句和疑问句。
1. — Peter, have you finished your
homework?
— Yes, Miss Lin. I’ve ____ finished it.