olving the problem a second time,you’d better be more careful____you made a mistake

1． We had so much homework. I didn’t go to bed Ifinished it yesterday evening.

The room is so dirty. ________we clean it now?—–Ok.

He stayed up too late every night,______ to catch up with his classmates.

He found it increasingly difficult to read, ______ his eyesight was beginning to fail[ ]