chọn đáp án, giải thích giúp e vs ạ
----- Nội dung dịch tự động từ ảnh -----
**Phoning Home**

Before the appearance of mobile phones, people in some parts of the world had to spend days travelling to the capital city or the (19) ______________ large city just to make a phone call. John Daily, (20) ______________ works for the charity 'Village Support', first went to Cameroon, West Africa, (21) ______________ 2002. At that time there were just over 100,000 telephones in Cameroon, a country with more than 17 million people. 'When I first got here, I had to take two days off work to go into Yaoundé, the capital, to phone (22) ______________ family in the UK,' says Daily. 'When I finally got there, I had to wait in a long queue to book a call. Then I waited again, often for several hours, before the call (23) ______________ connected. Most of the time the line was so bad that I could hardly (24) ______________ the person at the other end, or I would be cut off after only a few minutes.' Now mobile phones have arrived in Cameroon and things have changed. I don’t have to wait in a long queue anymore, and I can always hear the person at the other end!