Did the history of the hot-air balloon begin with a sheep, a duck and a chicken?
One day in 1777, Joseph Montgolfier was relaxing in front of the fire with his laundry drying nearby, wasn't he?
Did he notice that one of his shirts or suits had started to float upwards?
Why did he throw some small pieces of paper into the fireplace?
Who loved science and wanted to become an inventor?
Did he start trying to think of a craft that would be able to capture smoke and heat and lift people off the ground?
What did he begin performing experiments on?
It was heat and not smoke that had the power to lift things, wasn't it?
When did they present their first hot-air balloon?
Was the first hot-air balloon made from paper and cloth?
The Montgolfier brothers were too nervous to go up in the balloon themselves, weren't they?
Whom did they put in the basket that hung below the balloon for the two-mile journey?
Who gathered to watch the balloon floating high in the sky?
Did the first flight consisting of human passengers take place in Paris or in London on 21st November 1783?
2 Look, your brother has just come in. 3 I have tried to read War and Peace but I always stop because it's usually difficult.
4 We have never visited the Czech Republic. What's it like?
5 Peter has never given me his homework on time .
6 Have you ever been to the cinema with Tom?
7 I have never used that computer so I don't know what to do.
8 They have already done the homework. Here it is.
9 They haven't done the homework yet.It's for next week.
10 I've worked here for ten years.
11 I've worked here since 2000.
12 I've worked here all my life.