24. The reference book is of great value. ________ can be enjoyed from it until you have a deep understanding of it, however.
—Where is the shooting centre?—It is about 50 kilometres ______ the city of Beijing.
Though iPhone 4 is such a hit product, I won’t buy one unless its after service ______.
The 3G cell-phone must be of great use to ____wants to get the information through theInternet quickly.
—Can you give me some advice on what I said just now?—Sorry, my mind _____.
I’d appreciate _____ if you would like to teach me how to use the computer.