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。
Our English teacher gave us many    (建议) on the study of a foreign language.
He talked   ___   (兴奋地）to the reporters about his hopes of winning the race.
You should knock at the door before        (进入) someone’s house.
Are there any tickets ________ （可获得的）for this Saturday’s concert?