根据句意和首字母提示完成下列句子。There are sixty m____ in an hour．He is ill, and his i____ makes us feel sad．A lot of t____ are visiting the Great Wall, so it is very crowded．Good food and e____ help me to study better．It is n____ to eat a balanced diet.
下列说法正确的是（ ）
On holidays, they prefer to ______ at home rather than ______.
在创建文明校园中，要求学生不随地吐痰．从传染病角度看，随地吐痰的危害主要是（ ）
