---Fish need water to survive; _____ , we human beings rely on air to live.

It is difficult for children to change their eating habit later in life. _____，parents should encourage healthy eating from an early age.

Dr Watson wrote his name     and carefully at the top of the paper.

The story he told us was very________and we were________.

He had planned to make a compromise, but ______ he changed his mind at the last minute.