32. most of the earth's surface ( cover ) ....... by water, 33. the first festival ( hold) ...... nearly eight hundred years ago, 34. there's some behind us. I think we ( follow) ........, 35. my mother ( not visit) ..... us since he ( move) ....... to the new town, 36. this bike ( use) ..... for more than six years, 37. nowadays, many hisorical places ( destroy) ..... seriously, 38. It ( get) ....... hotter and hotter in june, 39. last month when we ( visit) him ...... him, he ( do) ...... an experiment on the upstairs, 40. tet hoilday in Viet Nam ( celebrate) ........ around January and February, 41. the Eiffel Tower in Pairs, It ( visit) ..... by millions of people very years