—What made little Tony so unhappy and cry in his room?— ______ to go hiking with his brother.

 ______ by a greater demand of vegetables, farmers have built more green houses.

Who would you rather _______ the watch?

When        if he hadany idea what the novel was about, Jack kept silent. He       have read it very carefully. 

A large number of people are held up in the railway station   for tickets to return  home．