We all know that we ________ our carbon footprint, but I suspect that many people wouldn’t be prepared to go as far as Joan Pick, a retired scientist living in south London.

The boy is the ant on the ground．

The security judge was very _________ whenshe explained that the driving licence was necessary for her work .

Look! There are lots of ________ birds flying over the trees.

Johnson said that he had a headache and wouldn’t come to the discussion.—____________. He always uses that excuse.