用所給詞的其適當形式填空：1.Onhis

問題詳情：

用所給詞的其適當形式填空：

1. On his ________ (twenty) birthday, he went to the museum with his parents.

went  _________ ( sail ) in Hainan Island last summer.

has already _________ (forget) his English teacher’s name.

are going to take a direct _______ ( fly ) to New York.

r ______ ( pollute)  is one of the biggest problems in the world now.

【回答】

twentieth 2、sailing  3、forgotten 4、flight 5、pollution

知識點：構詞法

題型：完成句子