根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。

小题1:We felt strange about his        ( silent) at the party as he used to be very outgoing.

小题2:“Will it be possible to get me another ticket?” he asked        (hopeful).

小题3:Rub this oil into your skin and your headache will soon      (appear)! Have a try!

小题4:It’s said that Chinese parents are         (strict) with their children than American parents.

苯丙酮酸尿症（）。

A.胆碱酯酶不可逆性抑制

B.酪氨酸酶缺乏

C.苯丙氨酸羟化酶缺乏

D.6-磷酸葡萄糖脱氢酶分子缺陷

E.巯基酶不可逆性抑制