Choose the best answers: Young people ... obey their parents

Choose the best answers
1) Young people________obey their parents
A.must         B.many          C.will          D.ought to
2) Laura, you and the kids just have dinner without waiting for me.
I ________work very hard today
A. Can          B.may          C.should           D.would
3) I_______be delighted to show you round the factory 
A.ought to          B.would            C.might.        D.can
4) Leave early so that you_________miss the bus
A.didn't.          B.won't      C.shouldn't          D.mustn't