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B. Each of these sentences contains an error in tense. Identify the error and correct it.

1. The show began by the time we arrived.

2. I saw the principal as I walk past the library.

3. We discovered that the bag was containing some stolen jewellery.

4. Connie celebrated her twenty-first birthday next month.

5. I knew the secretary lied when she said Mr Lin was not in the office.

6. At the age of 49, Albert Schweitzer had built another hospital beside the Ogowe River.

7. The dinghy could not reach Herman and Knut saw that Herman drifted away.

8. Ask any visitor to Nairobi what he or she considered to be the most exciting aspect of the city and the answer is almost certain to be shopping.

9. Ice still covered one-tenth of all earth's land.

10. By the twenty-third century, man is conquering all the planets in the solar system.