There have been so many school bus accidents recently._________, people are concerned about the school bus safety much.

The two pictures are similar, although not _______.

Mr. Black used to be busy. But now he’s tired and , so he has plenty of time to exercise.

If he had spent more time practicing speaking English before, he _____ able to speak it much better now.

下列各组词语中全都错误的一组是（ ）