用所给单词的适当形式填空。 1. My _____(big) problem is that I can't memorize the English new words. 2. His life_____(change) a lot in the last few years. 3. My grandfather used _____(swim) in the river when was young. 4. Would you mind my_____(shut) the door? 5. It often(take) us two hours_____(do) our homework every day. 6. I used to be afraid of _____(speak ) in front of a group. 7. I am very hungry, because I_____(not have) my dinner yet. 8. We find it easy_____(learn) English well. 9. Don't give up_____(try) , you will make it in the end. 10. He didn't _____(use) to like tests, but now he likes them very much.