Scientists who study ________ noise say that ________ average noise level in New York is 72.5 decibels.
| A．/；the | B．/；an | C．the；an | D．a；the |
— Have our travel plans been decided?
— No, still ______.
| A．out of order | B．up in the air | C．in the case | D．in the way |
_____ there was no conclusive evidence, most people thought he was guilty.
| A．Since | B．While | C．When | D．However |
David was always ______ his best in any danger, but at that moment he froze.
| A．at | B．in | C．for | D．on |
As the spokeswoman said, ______ we should take action against them depends on what they will do.
| A．why | B．if | C．whether | D．that |
In the reading room, we found her _______at the desk, with her attention ______on a book.
| A．seated; fixing | B．to sit; fixed | C．seated; fixed | D．seating; fixing |