I’m going to work hard _____it .Then _____ about Sunday evening?I'm going to help Han Mei _____her English.

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I’m going to work hard _____it .Then _____ about Sunday evening?I'm going to help Han Mei _____her English.
I’m going to work hard _____it .
Then _____ about Sunday evening?
I'm going to help Han Mei _____her English.

I’m going to work hard _____it .Then _____ about Sunday evening?I'm going to help Han Mei _____her English.
on
how
with

at (应为work hard at, not on)
how
with