Ex1: Combine the sentences to complete the sentences, using the words in brackets
1. The building is very old.He lives there (where)
2. I'll tell you something. You didn't know it before (which)
3. Mr. Minh is admired. He dedicates all his life to protecting enviroment. (since)
4. Give me a ring. You'll hear some news. (when)
5. She'll in Paris. She'll visit friends. (while)
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