I followed the man in a blue jacket thirty meters ______ me and watched him enter the hall.

Jack, please tell Tom to call me when he ______ back.

Only when the European countries’ financial system broke down _____to take measures to deal with those problems．

Alice stopped ____________ TV and started doing her homework.

Jim took ___ one-hour ride just now. What a short time he spent finishing such a long way!—He is ______ experienced rider.