24. In the reading room, we found her ______ at a desk, with her attention _______ on a book.
I tried phoning her office, but I couldn't __________.
I don't think these issues are __________ discussing with the ministers.
The rise of oil prices made scientists search for new energy re-sources to __________ oil.
The parents couldn't tolerate __________ the messy __________ in the room.
The speed of cars is usually limited __________30 miles per hour on the busy city street.