题目内容

根据下列句子的意思及所给出的汉语提示,写出空缺处的单词,固定短语或固定搭配的正确形式。
1. Please write an ________ (邀请) letter to________ (邀请) your pen friend.
2. Don't ________ (担心, 担忧) about your Chinese. We can help you.
3. It is ________ (必要的) for us to keep everything clean and tidy.
4. —Is China ________ from the USA? —Yes. There are many ________ between China and the USA. (不同).
5. We have a lot of friends ________ ________ ________(全世界)
1. invitation, invite
2. be worried
3. necessary
4. different; differences
5. the whole world-all the world
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