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将下面句子合并成带有定语从句的复合句
This letter is from my elder brother．He serves in the army．
Do you see the bridge?It was built last year．
What's the name of the girl?Her grandpa took part in the Long March．
The factory has got one success after another．We visited the factory last week．
指出下列各句中动名词所充当的成分。
①Climbing mountains is really fun．
②I found it pleasant walking along the seashore．
③What I hate most is being laughed at．
④We both share the swimming pool in summer．