—Jane, Peter has got a well-paid job in a foreign company.—You mean he is much _____ now.

As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.

Recent studies have discovered that fathers uniquely contribute to the development of their children, _____in low income families.

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

To be honest, I would agree with Tom, though not _____.