次の文の下線部と同じ用法の不定詞を, あとのアーウから 1 つっ選び, 記号で答えなさい。
口1) She has a lot of things to do today.
口2) Hewentto school to see Mr. White.
円3) They didnt think of anything to say.
円4) Bl began to sing a Song.
ア Iwant to eat an orange.
ィ Mike came to talk with me.
ウ Sheneeded a pen to write with.