Fill in a modal or a synonymous expression and the appropriate form of the verb in brackets.
1) There’s no reply when I ring him. He must have left the office.
2) Don’t give up so easily. You ………………. (do) it if you tried a little harder.
3) That’s no excuse! You know you ……………… (finish) this report by today.
4) He ……………… (mention) his plans on the phone last night but I really can’t remember.
5) Since she crashed the car, she ……………….. (walk) to work every day.
6) If you find something valuable, you ……………….. (take) it to the nearest police station.
7) Passengers ………………. (not walk) across the lines. They should use the footbridge.
8) You …………….. (know) better than to tell her all you
r secrets.
9) You ……………… (destroy) the letter as soon as you receive it.
10) You ……………… (enter) the building if you have a special pass.
Nhờ m.n giúp mk vs và giải thích vì sao