with a difficult situation, I decided to ask my parents for advice.

Studies show that people are more______ to suffer from back problems if they always sit before computer screens for long hours.

Jack, I haven’t seen your brother for a long time．—- He ________Shanghai on business for two months．

―_______does it take to get to school ― Twenty minutes .

coming—I’m not sure．He may be late or,____, he may not come at all．