用方框中所给词的适当形式填空。
train own feel satisfied able understand
Staying with animals often gives me a _______ of happiness.
Tom is the _________ of the car.
He smiled in _________ when his son won the match. 
The swimming players are in ______________ for the next sports meeting.
The ________people need our help.
The students __________ the teacher’s meaning yesterday.