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Answers B. Answers will vary. Sample answers:1. The average life expectancy in 1900 was 35 years.2. He thought there would be no C, X, or Q; spelling would be by sound; the language would be condensed; and English would be the most widely spoken language. The prediction about English being the most widely spoken language came true.3. He was probably thinking about airplanes.4. Automobiles have replaced all horse-drawn vehicles.5. There will never be tubes connecting houses to a store. This is impossible.

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Answers will vary. Sample answers:1. By the time we arrive at the picnic, it will have started to rain.2. I will have fallen asleep by the time the movie is over.3. By 2013, the summer Olympics will have taken place in London.4. By the time my father retires, he will have worked at his company for 20 years.5. He will have decided which college to attend by February.6. By the time you come to the table, the food will have gotten cold.7. She will have learned to drive by the time she graduates.

Answers will vary. Sample answers.

they will have been married for 25 yearshe will have been a vegetarian for four weeks

she will have been working there for 10 months

you will have been studying for four hoursI will have lost 15 pounds

I will have lived in Singapore for 15 yearswe will have waited for 30 minutesit will have been playing for three hours

Answers will vary. Sample answers.

will manufacture receive

make am going to buy

am going to travel get

will run starts

drive are going to see

Are going to argue change

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1. false (He paid 20 million dollars.)2. false (The first year of flights is already booked.)3. true4. false (The hotel will spin in order to reproduce Earth's gravity.)5. false (The moon hotel will be powered by solar power.)6. true