Give the correct form of the words in the brackets: What should we to do.......... our man-made wonders? (preservation) Traffic jams in most big cities are getting more and more serious, and it's hard to find a proper......(slove) giúp e vs mn ơi!!!!

$\text{What should we do to.......... our man-made wonders? (preservation)}$

$\text{=> preserve}$

$\text{Traffic jams in most big cities are getting more and more serious, and it's hard to find a proper......(slove)}$

$\text{=> solving}$

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