4. Fill in the blanks with suitable options :
a) _____ all your dreams be fulfilled (could / may) !
b) I ____ you to challenge me in a car race (dare/must).
c) Samuel _____ speak English fluently (shall / can).
d) During spring, one _____ see butterflies in the park. (should / can).
e) You _____ improve your writing skills if you want to excel in English (might / should).