选用动词短语的适当的形式填空

be supposed to; feel like; mix…up; make good use of ; devote…to; come up with

Xiao Feng works very hard because he believes that any student who _________the spare time can achieve high grades.
Why are you still at home, Mike? You ____________ go to school early this morning.
______________ teaching, he has no time to look after his own child.
She was very tired and ______________ having a good sleep.