【题目】Half of the population uses some kind of dietary supplement, and the number is on the ________ .

【题目】Drop in for a c if you have an hour to spare this evening.

【题目】There are seven (洲) in the world.

【题目】I went to the classroom as usual. But there, next to my desk, ______ I had never seen before．

【题目】It was ______ we were returning home ______ I realized what a good feeling it was to have helped someone in trouble.

【题目】My kids spend hours (聊天) on the phone to their friends.

【题目】There is a national park on the (边界) between Kenya and Tanzania.

【题目】Earlier reports ________ that a meeting would take place on Sunday.

【题目】Two pieces of (行李) have gone missing, which makes the woman very sad.

【题目】The police officers decided to conduct a thorough and ______ review of the case.