在新民主主义社会的五种经济成分中， 私人资本主义经济向社会主义国营经济过渡的形式是 ___________。

设A，B=,则A与B=（）

When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.

“Have you moved into the new flat? ” “Not yet. The rooms ________ (paint). ”

A great number of small power stations ________ (set up) in their county since liberation.