Нужна !

пример:
he has problems with health, that's why he is advised to stop (smoke)
надо вписать - smoking (перестать/бросить курить)

1. if you see them, remember (say) hello from me, please.
2.john, don’t forget (close) the door.
3.your memory is getting worse and worse. yesterday afternoon you went out and forgot (lock) the door.
4.sorry, i’ve forgotten (tell) you that marry wrote an email this afternoon.
5.did you remember (send) the letters i gave you the day before yesterday?
6.i think he’ll never forget (visit) london in 2010.