英语的(括号里的词改变时态)

I can't avoid _meeting_(meet) the manager because I have something important.
avoid doing sth.
_Serving_(serve) the people all through one's life is not easy.
因为后面后谓语is,所以用动名词serving
When to start for Beijing on holiday __has not been decided__(not decide) yet.
因为后面有yet,用于现在完成时的否定句,并且这个时间的决定是被动
Please remember _to give____(give) my best regards to your parents when you are back home.
remember to do 解释为记得去做某事 补充：remember doing 是记得做过某事
She is not what she used _to be _____(be)
used to be 是固定词组 过去曾经是/常常是
Hongkong's return is a great event thar（应该是that吧） __touches___(touch)on many people's life.
这是一句定语从句,从句部分 touch on many people's life 是用来修饰event的 因为是单数,所以用三单形式
Before _learning____(learn) the text ,you'd better learn something about the backgrand of stary.
before是介词,介词后面跟名词或动名词,这里用动名词learning