David said that it was______ his strong interest in literature_____ he chose the course.
| A．because of; that | B．because; so |
| C．because; that | D．why; because |
_____ in all parts of the state, pines are the most common trees in Georgia .
| A．Found | B．Finding them | C．To find them | D．They are found |
---____ the paper ?
--- No, I have still got one page to finish.
| A．Have you done | B．Do you do | C．Did you do | D．Had you done |
---What are you busy with ?
--- We are carrying out a research ____ the causes of cancer.
| A．into | B．onto | C．to | D．in |
– Jack?
-- ____.
| A．Present, Sir. | B．I am, Sir | C．Here, Sir | D．Yes, Sir. |
—Can youyour absence last Friday?
—Well, my car broke down and I had 10 get it taken to a garage．
| A．settle down | B．depend on | C．account for | D．refer to |