Do you know anything about Chinese knots— Yes. They are usually regarded ____________ symbols of good luck.

Sir, you ______be sitting in this waiting-room. It is for women and children only.

Two American couples each ___ a Chinese girl and they happen to be twin sisters.

In our city, ________ college students wantto work as a teacher in holidays.

下列各组句子中，加线词的意义和用法相同的一组是