Read and complete the sentences. e.g. NASA has sent people and machines to the moon
1) ... studies climate on the earth
2 reached Mars
3) ... studies the Sun
6)studies life on other planets
4)consists of many
countries
5)work in the International Space Station​

1the plane (has not landed) yet, but a lot of people (are waiting) in the terminal. 2. when i (woke up) in the morning, the rain (had stopped) already, and the birds (were singing). 3. my neighbour (had been) back some two months before, i (saw) him. 4. we (are walking) in silence. we already (have exchanged) the news and (are now thinking) about it. 5. hardly had he (opened) the file, when he (found) the information which he needed. 6. rick (had been in love) with lora for a long time before he (proposed) to her. 7. the old man used to tell his grandchildren about the war in which he (had taken part). 8. the book turned out to be much more interesting than i (had expected). 9. they (had arranged) everything by evening, and (were waiting) for the guests. 10. tanya (had trained) hard before she (became) a professional dancer. 11. we wondered if they (had got) our message. 12. the young man thanked his parents for all they (had done) for him. 13. when i first (saw) her, i (thought) she (was) the most intelligent woman i (had ever met). 14. even though the house (has been) empty for two years, it (is) in good condition. 15. the patient thanked the doctor for all the attention he (had been giving) him for the past six months. 16. ted said that his father's opinion (had always been) important for him. 17. he was happy. his dream (had come) true. 18. the room looked beautiful, as she (had changed) the furniture and the curtains