IV.    Read, then choose the best answer (A, B, c or D) to complete the gap.
The next generation of telephone users will probably laugh (1)     we explain how we used to stand next to a wall in the kitchen  to (2)     a phone call. Mobile communications, already highly advanced compared with a decade ago, will completely change communications in the next few years.
(3)     there are millions of people using mobile phones, most people know (4)     
     about the mobile telecommunications industry and its technology. There are three types of mobile phone. These are hand portables, pocket-sized hand portables and transportables. The smallest and most popular are the pocket-sized hand portables. These work on rechargeable batteries, which allow an (5)     of up to 80 minutes’ conversation. Mobiles that are fitted permanently in a vehicle do not (6)     on separate batteries. They require an external aerial on the vehicle. This can mean a stronger signal with clearer
(7)        . Transportables have a high power capability and can be used (8)     anywhere. They come with powerful battery packs for longer, continuous use and may also be put (9) a vehicle, using its electrics. They ( 10)     to be bulkier than hand portables.

1. A. unless    B. when    C. while    D. whether
2. A. make    B. give    C. take    D. do
3. A. In addition    B. Because    C. As a result    D. Although
4. A. little    B. some    C. few    D. lots
5. A. amount    B. account    C. activity    D. average
6. A. rely    B. create    C. carry    D. insist
7. A. wave    B. letter    C. speech    D. speed
8. A. mostly    B. hardly    C. most    D. almost
9. A. on with    B. into    C. up with    D. in to
10. A. used    B. have    C. tend    D. are