______ apple fell from the tree and hit him on ______ head.
| A．An; the | B．The; the | C．An; 不填 | D．The; 不填 |
We must set a limit __________ the expense of the trip.
| A．to | B．on | C．for | D．with |
He’s thinned down a lot since he ___________ a diet.
| A．got on | B．put on | C．kept on | D．went on |
--- Did you find your book last night?
--- Yes, I finally managed __________ the book I was looking for.
| A．to find | B．finding | C．to found | D．founding |
What are the differences between the American and British ____________of government?
| A．systems | B．religions | C．customs | D．theories |
Jack has made great achievements in his work, and the harder he works, the _________ he becomes.
| A．religious | B．energetic | C．curious | D．independent |