_____ for his mistake, the little boy could not but_____to his teacher that he was wrong.

Thenextthinghesawwassmoking_____frombehindthehouse. [ ]

Who will be our Biology teacher this term— Mr. Green will teach __________ Biology and his lessons are worth ________.

There is a new problem ________ in the popularity of private cars that road conditions need improving [ ]

We will plant _______ trees next year.