题目

用括号内所给单词的适当形式填空。1. Rubbish ________ (make) the park very dirty.2. David and Tom ________ (be) in Class One.3. We ________ (not watch) TV on Mondays.4. Mike ________ (not go) to the zoo on Sundays.5. He often ________ (have) dinner at home.6. What ________ they often ________ (do) on the weekend?7. ________ you ________ (read) newspapers every day?8. The teacher ________ (teach) us English on Saturdays.9. I ________ (take) a walk every evening.10. The earth ________ (be) round. It ________ (run) around the sun.下列原始大气成分中，正确的是（　　） A、甲烷、氧气、氢气、氮气B、氮气、甲烷、氨、氢气C、氢气、氧气、氨、氮气D、甲烷、氧气、水蒸气、氢气