From space, the earth looks blue.This is ________about seventy-one percent of its surface is covered by water.
He was wearing a lot of clothes to _____ himself from the cold.
They were_____ popular that their fans formed clubs in order to get more familiar_____ them.
Would you please keep silent? The weather report ________ and I want to listen.
You should inspect the wheels regularly, and replace them ______ they cause you trouble.
If you cheat in the exam, you’ll never ______ it.