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36. Without .................., all the resources necessary for life would be damaged, wasted or destroyed. (conserve).

Rewrite the sentences below, beginning with the words given.

37/ We have learned English for 5 years before but now I give up. (used to)
=> We used to ____________________

38/ I started learning English five years ago. And now I am still learning it (Using present perfect)
=> I have ____________________

39/ After John had washed his clothes, he began to study (Using before)
=> Before John started ____________________

40/ I always get up early in the morning.
=> He is used ____________________