根据句意，在答题卡对应题号的横线上，写出括号内所给单词的适当形式。
【小题1】How can I trust you? You’ve _________ (lie) to me again and again.
【小题2】— Robin donated a lot of money to the charities last week.
— Oh, really? Maybe he is the ____________ (wealth) man I have met.
【小题3】There may be no __________ (possible) for you to find happiness if you depend on one thing or one person.
【小题4】Doctors have learned how to recognize autism (孤独症), but much is still ___________ (know) about its causes.