A red sky in the morning _____ to be a sign of bad weather.
It is he frequently returns home late makes his parents concerned about him.
(2013·马鞍山模拟)It was not until midnight they reached the camp site.
, you should keep it a secret; or you will ruin our plan.
Not until yesterday that I had made a serious mistake.
—Mike likes watching TV but he doesn’t like playing football.— .