Sarah had to call a taxi because the box was _______ for her to carry all the way home.

The teacher told Tom to sit ______ in class.

 They have earned lots of money, so I______ believe that the business is a success. 

The patient’s progress was encouraging as he could ______ get out of bed without help.

 ------What do you think of our design for the new car？------Pretty good. But I find theirs is _____ worth considering and studying.