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Here are the corrections: 1. During the bleak winter, food became **too scarce** that starvation and famine were widespread. (Error: "scared" should be "scarce", which means insufficient or hard to find) 2. **During** the campaign, young volunteers helped build bridges, roads and houses for some of Viet Nam's most disadvantaged families. (Error: "While" doesn't fit the context; "During" is more suitable for the sentence) 3. Thanks to advances in medical science, **life expectancy** for both men and women has improved greatly over the past decades. (Error: "life expectation" should be "life expectancy", which refers to the average length of time a person is expected to live) 4. I decided to join the English club **so that** I can practise my English more frequently. (Error: "such that" is a more formal or technical phrase; "so that" is more suitable for everyday conversation) 5. Although **the fact that** the work was unpaid, she found it an enjoyable and rewarding part-time job because she had a good opportunity to help other people. (Error: "unpdid" should be "unpaid", which means not receiving payment for work; also, "opportuninty" should be "opportunity") 6. Many successful film **directors** are former actors who desire to expand their experience in the film industry. (Error: "directions" should be "directors", which refers to people who direct films) Here are the completed sentences: 1. If you practice harder, you will have better grades. The more you practice, the better grades you will have. 2. The heavy rain prevented us from walking along the beach. Because of the heavy rain, we couldn't walk along the beach. 3. The last time he went to that museum was three years ago. We haven't been to that museum for three years. 4. As he gets older, he wants to play computer games less. The more he gets older, the less he wants to play computer games. 5. They last saw the film on TV since he was eleven. They haven't seen the film on TV since he was eleven. 6. He last wrote to his best friend two months ago. He hasn't written to his best friend for two months. 7. The heavy rain did not prevent John from getting to the meeting on time. In spite of the heavy rain, John got to the meeting on time. 8. My brother started to learn Spanish six months ago. My brother has been studying Spanish for six months.