Combine two sentences into a new one using the given words in brackets

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> Combine two sentences into a new one using the given words in brackets.
Do not change the given words in any ways.
Question 37: My friends spent less time playing computer games. They concen-
trated on studying for the final exam. (so as to)
Question 38: Linh and Thuong ate Quang noodles for breakfast. Then they went
for a walk around Hoi An ancient town. (Before)
Question 39: Many volunteers supported the victims of the flood in Ha Tinh.
They were very kind. (to support)
Question 40: Water pollution gets more serious in the future. It affects the
development of the economy and society. (If)