He came to my class every week, but his attitude ________ he was not really interested in the subject

My house is very near a busy street. —It ________ be very quiet.

He’s never seen the film Rio2 (里约大冒险2) before, _________ he—_________. He went to see it last week.

Everyone has periods in their lives __________ everything seems very hard.

Do you think he is the only person for the job—I’m not quite sure but he’ll prove_______ to the task.