Translate English 10 sentence, speed! ....

1. It is very necessary for you to get along well with your classmates. Playing chess with you is a pleasure. It is useless to read without thorough understanding. 4. It's daydreaming to exercise five kilograms in two hours. It is difficult to predict the result of the football final this weekend. It's very generous of you to treat the whole group of students with chocolate. No matter where you travel, you'd better do as the Romans do. Everyone knows that our school has taken on a new look. 9. The authorities estimate that the number of casualties in this air crash will be as high as 120. 10. It is natural that children should support their elderly parents.