______ is known to all is that good friends ______ happiness and value to life.
The written record of our conversation doesn’t ______ what was actually said. There are a lot of mistakes.
The local government has been accused of not responding _________ to the needs of the homeless in the flood-stricken area.
Despite the fact that all three teams ________ different approaches to the problem, they were all immediate successes.
This machine is very easy ______. Anyone can learn to use it in a few minutes.
Every minute must be made full use _______ in class.