Прочитайте текст и отметьте предложения под текстом, соответствуют ли они тексту: T (true- правда), F (false-ложь) or DS (doesn’t say- не сказано в тексте

2. Wireless communications (B)allow people greater flexibility while communicating.
3. A microphone converts(A) messages(B), like sounds(B) or other data, into electronic impulses.(B)
4. All wireless communication devices(B)use radio waves(B) to transmit and receive signals.(B)
5. The transmitter uses(A) an oscillator to generate radio waves.(B)
6. Construction and utility workers(B)often use hand-held radios (B)for short-range communication and coordination.
7. Simple two-way radios(b), called walkie-talkies(B), have been popular children’s (1)toys(B) for years.(B)
8. An example of a device that sends(A)one-way transmission is a pager, which is a radio receiver.
9. Aircraft pilots(B) use radios(B) to communicate with air traffic controllers (B)at airports.(B)
10. A device that functions(A) both a transmitter and a receiver is called a transceiver.
11. Speakerphones(B) allow callers’ (1)hands(B) to be free.

15. If you reduce the price we will place an order with you. 16. They have been producing these goods for the whole month. 17. Who was there in the office when you arrived? 18. How often do you effect payment? 19. Why did they let you down? 20. They usually prefer prepayment. 21. There were a Sales Manager and two trainees in the works then. 22. What mode of transportation is the shipper going to use? 23. They will suffer losses next time. 24. We will call you as soon as the ship comes into the port. 25. The data* in your calculations are (OR is) not accurate at present. 26. The news in this letter is awful. 27. This means of transportation is the most suitable for us nowadays. 28. I hope the Manager will approve your report. 29. He was looking through the advertising materials when I came. 30. They were shipping the goods when he came yesterday evening. 31. We will be making precise calculations when he enters.