The a__________ age of the students in our class is 15. 2. The farmers used a c____________ to kill the insects in their field. 3. People try to p___________ the rainforest from being destroyed. 4. The pilots in the sky c_____________ with the airport by radio. 5. This factory p___________ this new kind of car. 6. Are your grandparents still a___________? 7. This f___________ is known to all the people in the village. 8. Every day the doctor w___________ that we must wear a mask while going out. 9. Carbon dioxide and oxygen are both g__________. 10. As we all know, Coffee is Brazil's main p___________. 11. I s___________ the new coronavirus will be gone in two months. 12. The air was so cold that we could hardly b___________. 13. The trees r____________ oxygen back into the air. 14. Breast milk is the n___________ food for young babies. 15. J__________ the two pieces of wood together. 16. I can h___________ believe that the Chinese medicine is so magic. 17. The fire happened last night d___________ all his precious paintings and calligraphy. 18. They held a meeting to e____________ ideas about the project. 19. N__________ does not provide everything we want. 20. My m__________ reason for learning English is to get a better job. 21. No living things can live without o____________. 22. Our school covers an area of 73 h____________. 23. She had the most expensive i__________ on the menu. 24. The water in the stream was not polluted. It was p___________. 25. Can anything r___________ a mothers love and care? 26. There is a n___________ smell coming from that old house. 27. These angels in white in Wuhan are brave f___________. 28. I've written down all the new words I've learned in a n____________.