171.   做事要三思而后行。   Think it over before you act.
172.   回头/一会见。   See you (soon/ later)
173.   暑假到了。   The summer holiday/ vacation comes.
174.   祝你们假期愉快！ Wish you a good holiday!Have a good/ nice/ wonderful time in / during the holiday!
175.   祝你们好运！   Wish you good luck!   Good luck to you!
176.   祝你们旅途愉快！ Good trip to you! Have a good trip!
177.   别忘了完成假期作业。Remember to finish your vacation work.
178.   你必须写日记，早晨大声朗读。You must keep a diary and read aloud in the morning.
179.   记住，安全第一。 Remember safety first.
180.   咱们常联系。     Keep in touch with me.
181.   如果你们遇到不理解的题，可以写信问。If you come across puzzling questions, you can write them in your letters.
182.   欢迎假期到我家来玩。Welcome you to my home during the holiday.
183.   好，下学期见。   OK. See you next term .
184.   欢迎你们返校。    Welcome you back to school.
185.   很高兴又见到你们。Glad/ Nice to meet you again.

171.   做事要三思而后行。   Think it over before you act.
172.   回头/一会见。   See you (soon/ later)
173.   暑假到了。   The summer holiday/ vacation comes.
174.   祝你们假期愉快！ Wish you a good holiday!Have a good/ nice/ wonderful time in / during the holiday!
175.   祝你们好运！   Wish you good luck!   Good luck to you!
176.   祝你们旅途愉快！ Good trip to you! Have a good trip!
177.   别忘了完成假期作业。Remember to finish your vacation work.
178.   你必须写日记，早晨大声朗读。You must keep a diary and read aloud in the morning.
179.   记住，安全第一。 Remember safety first.
180.   咱们常联系。     Keep in touch with me.
181.   如果你们遇到不理解的题，可以写信问。If you come across puzzling questions, you can write them in your letters.
182.   欢迎假期到我家来玩。Welcome you to my home during the holiday.
183.   好，下学期见。   OK. See you next term .
184.   欢迎你们返校。    Welcome you back to school.
185.   很高兴又见到你们。Glad/ Nice to meet you again.