将答案的选择在每一空,注意用大写字母。 1. It has been proved _________ eating vegetables in childhood helps to protect you against serious illnesses in later life. A. if B. because C. when D. that 2. The last time we had great fun was ________ we were visiting the Water Park. A. where B. how C. when D. why 3. ________ matters most in learning English is enough practice. A. What B. Why C. Where D. Which 4. The traditional view is _____ we sleep because our brain is “programmed” to make use do so. A. when B. why C. whether D. that 5. ______ parents say and do has a life-long effect on their children. A. That B. Which C. What D. As