Раскройте скобки поставив слова в скобках в правильную форму 26. let answer this question. (i) 27. where he last summer. (to be) 28. she gave me a lot of (advice) 29. economics an important science. (to be)

26. Let me answer this question. 
27. Where did he be last summer?
28. She gave me a lot of advices.
29. Economics is an important science.