Fill in with the right form of the verbs and read

Fill in with the right form of the verbs and read the story.
If the weather is fine,we'll go for a picnic.
If we go for a picnic,we'll eat barbecue.
If we ______ barbecue,we'll not ______ be hungry.
If we ______happy,we'll tell jokes.
If we______ jokes,we'll laugh a lot.
If we ______a lot,we'll enjoy ourselves.