印度河流域的早期文化被称为 ()

The more we looked at the picture, ________.

________ (fail) several times, they need some encouragement.

When I came through the customs at the airport, I had to pay ________ on a clock I had bought.

我国对资本主义工商业社会主义改造采取的国家资本主义过渡形式有_____。