根据句意和首字母提示完成下列句子。
小题1:There are sixty m___________ in an hour．
小题2:He is ill, and his i__________ makes us feel sad．
小题3:A lot of t__________ are visiting the Great Wall, so it is very crowded．
小题4:Good food and e__________ help me to study better．
小题5:It is n_________to eat a balanced diet.