Look, dark clouds are gathering. It is ______ to rain soon.

I could hardly tell the twins apart because their appearances are only ____ different.

　　  　, we lack practice and experience nowadays in dealing with the complicated
economic situation.

The singer sang the song ______ for her mother.

Exercise is ______ as any other to lose unwanted weight.

He was _____ moved by the story and read _____ into the night.

His parents，_________，did not look after him very well—the elbows of his jacket were patched and his boots were badly worn.

To be an astronaut, you must not only be strong in mind, but also be sound mentally and___.

_____ he graduated from college, he became a success in business.

The boys marked ____ a football court on the playground.