Complete the second sentence so that it has the same meaning as the first.
21. It’s a long time since men last went to the Moon.
Men ………………………………………………………………………………………………………………………
22. “How long does it take to get to Mars?” Jim asked his father.
Jim asked …………………………………………………………………………………………………………………
23. I had learnt about Pham Tuan before reading articles about him.
Before I ……………………………………………………………………………………………………………………
24. The earthquake has caused the closure of many roads in the area.
As a result ………………………………………………………………………………………………………………
25. Don’t press that button on the keyboard, or you’ll lose what you’ve written.
If ……………………………………………………………………………………………………………………………
26. Most parents want their children to study a useful subject leading to a good job.
Most parents would rather ……………………………………………………………………………………………
27. Martin can’t apply for NASA astronaut training because he is not a U.S. citizen.
If ……………………………………………………………………………………………………………………………
28. “I went to the National Air and Space Museum with my friends yesterday,” he said.
He said ……………………………………………………………………………………………………………………
29. They have sent around 8,378 satellites to space since the launch of Sputnik 1 in 1957.
Around 8,378 satellites …………………………………………………………………………………………………
30. Do you know the reason? Many people around the world learn English for this reason.
Do you know ……………………………………………………………………………………………………………