—People ________ wear helmets(头盔)when they ride e-bikes according to the traffic rules.
—Yes. Or they will be punished.
must
can
may
What ____ sad news! We can’t get the movie tickets.
—How is this kind of apple? —It tastes ____ and sells ____.
---What’s wrong? ---I argued with my friend this morning. ---___________
I went to his house _________ say sorry to him.
I enjoy playing computer games, but I can'ttoo much timethat