How long does it take you ---(exercise) every day?It's important for models ---(keep)slim.I don't know how l can finish the work.(改为同义句)l don't know --- --- ---the work.

问题描述:

How long does it take you ---(exercise) every day?It's important for models ---(keep)slim.
I don't know how l can finish the work.(改为同义句)
l don't know --- --- ---the work.

to exercise
to keep
how to do

to exercise
to keep
这两个都是固定句型
how I can finish the work = how to finish the work