If we are all willing to make____with each other_____when we are in dispute，quarrels and conflicts will be avoided and we will surely live in peace.

Scientists have found no ________of life on Mars so far,though great efforts have made on the research.

—Mum, I will leave for tha party. —Remember your     .thank your friend when you leave the party.

The tragedy of the innocent young Brazilian boy killed by the British police has put the British police in a difficult________.

Many countries are increasing their use of natural gas, wind and other forms of ______.