16. You ______ wear your face mask and face shield at all times when you are outdoors. It is a necessity nowadays. a. shall b. may c. might d. can
17. The typhoon _______ hit the country today, so make sure you have full stocks of groceries at home. a. should b. ought to c. cannot d. might
18. _______ you help me put up the Christmas decorations tomorrow? a. might b. should c. can d. ought to
19. _______ you like to go volunteering with us in the relief operations for the super typhoon victims? a. should b. would c. can’t d. might
20. It _______ be the rain which interrupted the internet connection. a. could b. shall c. should d. may​