______ along with host families, I believe, language travel students are likely to get enough
language practice.
| A．Stay | B．Having stayed | C．Staying | D．To stay |
—May I open the window to let in some fresh air?
—__________.
| A．Come on! |
| B．Take care! |
| C．Go ahead! |
| D．Hold on! |
When I saw the beautifully decorated house, I really wondered __________ she could manage that all by herself.
| A．why |
| B．when |
| C．where |
| D．how |
I__________ it to my parents that I have lived through those hard times.
| A．own |
| B．appreciate |
| C．thank |
| D．owe |
To understand the grammar of the sentence, you must break it __________ into parts.
| A．down |
| B．up |
| C．off |
| D．out |
If you go for a long ride in a friend's car, it's the custom to offer to __________ some of the expenses.
| A．pay |
| B．pay off |
| C．pay for |
| D．pay back |