161. 1. the, the
2. the
3. -, -
4. the, -
5. the, -
6. an, the
7. a, -
8. a, a, -
9. the, -, the
10. -, a, the, -
160. 1. Westminster is a political centre of London.
2. There are a lot of different offices in Westminster.
3. Westminster Abbey is one of the most famous churches in London.
4. He hasn't washed up yet.
5. Have you ever been to Africa?
6. They haven't seen him today.
7. She has done her homework already.
8. Our teacher was in London two years ago.
9. It takes him an hour to do the shopping.
10. It didn't take me long to get to the square.
162. 2. who
3. which
4. who, which
5. which
6. who
7. who
8. which
9. who
10. which