Желаю сдать экзамен! - Good luck with your exam(ination)!
Сдать бы тебе экзамен! - I wish you to pass the exam. I do hope you do well at the examination.
Желаю хорошо отдохнуть! - Have a good rest! I (do) hope you have a good rest.
Приятного аппетита! - Bon appetit! I hope you enjoy your breakfast, coffee, etc. Enjoy your meal!
Желаю поскорее выздороветь! - Get well (and) soon!
Желаю счастливого пути! - Happy journey! I wish you a happy journey.
Счастья тебе! - I wish you joy! I wish you happiness!
Удачной тебе поездки! - I hope the trip will be everything you wish for.
Хорошей погоды! - Let's hope the weather keeps.
Долгих лет жизни! - May you live to be a hundred! May you live another ... years!
Многих лет жизни! - May you live on and on and on!
Поздравляем вас ... с вашим семидясителетием. Желаем долгих лет жизни. - Happy birthday to you, dear ..., and many happy
returns of the day! Cheers, dear ...! On the 70th birthday I wish you
health, goodcheer and many more years of happiness and joy!