The cat with a white tail isn’t _______. I think itbelongs to _______.

When Helen saw her tutor nod ______ to her, she calmed down and went on with her performance

Though the girl had been suffering from the blood disease, she acted as if nothing____ to her while facing her friends and relation.

Walter’s work ________ efficiently, the boss decided to promote him to senior manager.

The rivers will become dirtier and dirtier we take action to protect them.