✔ 最佳答案
上面 Answer no. 3 is wrong
It is worthwhile to remember {1. that} we should treasure our close friends. A popular {2. saying} goes like this: it takes three years to build a close {3. friendship} but it takes only three days {4. to} destroy it. A true friend is like a rare diamond, extremely precious and valuable.
3. build = 建立 => build a close friendship = 建立良好友誼