The little boy took an instant liking to his babysitter_______

The teacher tries her best to________ sure that her students can understand her explanations.

It’s difficult ______ us to go out because of the bad weather.

Of course, in (27) _____ none of us is so easily defined.

The story of communication is, in many (30) _____, the story of the human race: we have always shared knowledge and built relationships, whatever means of communication we use.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Thanks to advances (A) in medical science, life expectation (B) for both men and women has improved (C) greatly over the past (D) decades.

The mother tries hard to ______ sure that her children get the best of everything.