Many boys enjoy _______ football, basketball or baseball

－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

目前预测砂岩-泥岩异常压力常用方法有:钻前的___ 、钻井过程中的___ 、钻后的___ 。

29．__________ when you are on the bus or bike．

Either he or I ______to the airport.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

Hurry up, or you ______ catch the train.

预测方法很多，不同的预测方法往往有不同的适用范围，有的方法适用于长期预测，有的则适用于中、短期预测，等等。例如定性方法往往适合于________。