根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。

根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
小题1:Their _____________ （婚姻）lasted 31 years.
小题2:Designers need to do further ________(试验，实验)before the cars are made in factories.
小题3:- You look slimmer and healthier than before.
- Yes, but I _____________ (更喜欢)sweet snacks to vegetables before.
小题4:Many teenagers have little __________ （交流）with their parents.