42. This supercircleet isn't as expensive as the one across the street. (less) This supercircleet is less expensive than the one across the street. 43. You feel unhealthy because you don't take any exercise. If you took some exercise, you wouldn't feel unhealthy. 44. We couldn't carry out our project. It rained heavily. Because of the heavy rain, we couldn't carry out our project. 45. "I'll help my mum with the housework this weekend", she said. She said she would help her mum with the housework that weekend. 46. Using computers may have harmful effects on our minds and bodies. 47. What a learned man he is! 48. There is no point in persuading her to join in that activity. 49. He has to get up early; otherwise, he will miss the first train. 50. The United States lies between Canada and Mexico. I hope these answers are helpful! Let me know if you need further assistance or have any other questions related to English language learning!