2. the idea e_______ only in the minds of poets. 3. _______ (氧气) is one of the basic elements of substance. 4. there are many _________ (学说) about the origin of life. 5. the _________ (猛烈的) winds buried the village in sand in half an hour. 6. the ____________ (气氛) changed as soon as lily walked in. 7. smoking is h________ to our health. 8. if you ________ (乘) seven by 15 you get 105. 9. i bought this loaf of bread in the c______ store opposite the street. 10. we need to make f___________ changes to the way in which we treat our
