Do you want to keep goldfish — No, they are ____ difficult ____ take care of.

Look, Tom is annoyed again.—You know, no one likes _________inpublic.

o Chinese scientists have made a wonderfuldiscovery, which marks a major _______ in the basic research in the field.

he debt problem worsening, it isgoing to be a ______ test for EU to help Greece out of trouble.

Before the storm,fishes in the pond usually________ themselves out of the water to get fresh air.[ ]