不填，直接spend most of the time in office at school keep in touch 这是由于固定搭配的原因，只要记住就好了。
I seem to spend （不填）most of the time worrking at home, not in (the) office.
It is difficult to keep in (不填) touch with the friends I made at (不填) school.
most of是固定搭配，keep in touch也是固定搭配，不需要用冠词，at school也一样
都是固定用法，都不填，没有很合理的解释，硬背吧...
keep in touch
at school 是固定短语
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