It has been so foggy recently – Cheer up! The fog______ to clear up from tomorrow.

He _______ us that everything would go according to plan, but it turned out a failure.

At horse races, everyone has already studied the form (类型) of the horse______.

Not until the early years of the 19th century ________ what heat was.

The mother,along with her two daughters,________ from the sinking aircraft by a passing ship.