ข้อที่ 17. Few devices save more minutes-or waste so many more-than the telephone. To discourage callers who don’t know when it’s time to …11…. the phone, R. Alec MacKenzie. author of New time Management Methods, suggests…12…. a time limit, then signaling the …13…. of your conversation with a phrase such as “Before we hang up…” You can save…14…. more time by not taking every …15…. call. Before you make a …16…. keep its purpose clear. If you need to …17…. more than one subject, jot them …18…. then stay on track. Busy people appreciate…19.... Keep a record of when people you call regularly are …20….busy and call them at those times. Even better, make appointments to call important contacts.