【题目】We planted ________ trees last year.

【题目】—I love pop music ________ folk (民间的) music.

【题目】The ________ to a book is the part that comes at the beginning and tells you what the rest of the book is about.

【题目】You'd better set out early. There are ________ people in the street at that time.

【题目】The first mobile phone was invented in the USA ________.

【题目】—Be careful! The bus is coming.

【题目】Some of the scientists are from Russia, and the rest are from America.

【题目】—My parents love me so much. They help me do almost everything.

【题目】—We should try to protect the Asian elephants, or they will die out soon.

【题目】—I really don't know what to do next.