13. Li Ning is my favorite gymnast.
李寧是我最喜歡的體操運動員。
還能這樣說：
Among all the gymnasts, I like Li Ning best.
My favorite gymnast is Li Ning.
14. The students must practise gymnastics on the playground in the morning.
學生早上必須在操場上做操。
還能這樣說：
The students are obliged to do gymnastics on the sports ground in the morning.
The students are ordered to practise gymnastics on the sports field in the morning.
應用解析：
the morning after the night before 宿醉；
morning glory 牽?；?；
the morning of life 生命之初期，青少年時期；
toward morning 接近早晨時
15. Children are forbidden to do some dangerous gymnastic performances.
不允許孩子們做一些危險的體操動作。
還能這樣說：
People don't allow children to do some dangerous gymnastics.
Children should be kept far away from some dangerous gymnastic performances.
應用解析：
a child prodigy 神童，天才兒童；
child labor 童工；
child memories 孩提時的回憶；
with child 懷孕的；
a child of fortune 命運的寵兒；
a child of nature 自然之子，天真無邪的人
16. Is this your very first time to do gymnastics?
這是你第一次做體操嗎？
還能這樣說：
Do you practise gymnastics for the first time?
Do you just start to do gymnastics?
應用解析：
first and foremost 首先，第一；
at first glance 乍看之下；
not have the first idea about sth. 對某事一無所知；
first hand 一手的，直接從源處獲得的；
first lady 總統夫人，州長夫人
17. I haven't taken exercise for a long time.
我很久沒運動了。
還能這樣說：
It has been a long time for my last exercise.
Doing exercises has faded out of my life for a good while.
應用解析：
to cut a long story short 長話短說，簡而言之，總之；
take a long view 從長遠考慮事情、效果等；
take a long look at 謹慎仔細考慮；
not by a long shot 完全不，決不；
in the long run 從長遠看，最后，終究