Any computer, be it a large PC or a small embedded computer, is useless if it has no means to interact with the outside worl

Before welding is permitted on a fuel tank, it must be certified or declared （）

Sometimes it's easier to talk to a stranger（）to an old friend or a relative.

When it hears the trigger word, it plays it back. “trigger word” here means a word that initiates a process or course of action.

______ it or not , his discovery has created a stir in scientific circles.

It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steamThe above sentence probably means （）.

Believe it or not, when first (introduce) ____ to Europe, tomato was thought to be poisonous.

Project（71）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．

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．

● Project（71）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.（71）

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

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