这是篇段首句续写式作文。经分析，文中所给的前两段的段首句均可作为该段的主题句。第三段中，可根据所给的段首句暗示的写作方向，得出结论，并以此为该段主题句。故第三段主题句为：One must consider both sides of the factors carefully before making up his mind。由此完成通篇构思，其全文和各段框架具体构思如下：
1.Attending school abroad has many advantages.
2.There are also some disadvantages.
3.One must consider both sides Of factors carefully.
第一段 Topic Sentence Att梅州市癫痫病治疗官网ending school abroad has many advantages.
l. widen our vision
2. travel widely
3. improve the second foreign language
4. acquire updated knowledge
第二段 Topic Sentence There are also many disadvantages。
1. language barrier
3. high tuition and cost of living
第三段 Topic Sentence One must consider both sides of the factors carefully.
1. 北京羊癫疯医院有哪些good to study the subject weak in our country
2. should consider the disadvantages
widen our visionhorizon 开阔视野
get acquainted with 了解
first-rate facilities 一流设备
language barrier 语言障碍
... In the first place, … Secondly, … Thirdly, …
But the most important thing... For all these...
However, … As a result, ... Besides, ... Furthermore, …
羊癫疯的常见症状Therefore, ... On the whole, … But on the other hand, ...
1. Attending school abroad has many advantages.
2. Attending school abroad has many positive aspects.
3. Studying abroad has many strong points.
4. Studying abroad has many favorable aspects.
1. But on the other hand, one must not lose sight of the disadvantages.
2. But most important of all, o小儿癫痫病病专科医院ne should not neglect the disadvantages of studying abroad.
3. Finally, one should always think carefully before making up one's mind.
4. Finally, everything depends on his personal financial status. If the advantages can outweigh the disadvantages, he should make up his mind to study abroad. Otherwise, it's advisable to study at home.