将下列句子中的汉语译成英语，注意用词的正确形式。
①Never ( 放弃 ) learning English. It's much too useful.
②I don't want to go to Hawaii because it's too （游客很多的）
③I (想出) a good idea.
④There are (至少) eight hundred students on the playground.
⑤They stayed at home (而不是)going to the park.
