请根据以下提示并结合一个事例，就“潜能无限”这一话题，用英语写一篇短文。

As we all know, one’s potential is limitless. Especially in times of crisis, you can never imagine how powerful one’s potential will be. Therefore, it’s unwise to set limits to your potential.

注意：

不得照抄英语提示语；除诗歌外，文体不限；

文中不得透露个人姓名和学校名称；词数120以上。   

 The _____ in temperature is broadcast twice a day in the channel.

A. diversion       B. variety        C. variation      D. diversity

Mr Green often says “what is learnt in the ______ lasts to the grave”, intending to impress on us the significance of reading more books while we’re young.

A. brochure     B. association   C. encyclopedia        D. cradle

 The supermarket sells many foods that have been_____ , so it is convenient to feed your stomach.

A. produced        B. processed        C. stored       D. charged

 The truck ______ the trainees miles from anywhere and they had to reach the stated destination within 5 hours totally on foot.

A. doomed      B. deposited     C. simplified         D. reckoned

 Before the economic crisis came John had sensed the firm was to be ruined and he _____ just in time.

A. pulled out      B. pulled off    C. pulled up          D. pulled down

 Good ads may well ______ the consumers’ emotional needs as well as providing information.

A. see to         B. turn to       C. lead to            D. refer to

 If the doctor is ______ this afternoon, I will take my little daughter to him for a thorough checkup.

A. accessible     B. available       C. convenient       D. handy

 No more of this fancy playing with words---I want some ______ talk here.

A. direct         B. concise         C. straight         D.informal

 Just as a book is often judged ______ by the quality and appearance of its cover, a person is judged immediately by his appearance.

A. outwardly     B. initially         C. uniquely        D. previously