选词填空：1、Some children______(couldn’t/aren’t able to)speak before they are two.
2、Jim has only managed to leave home because he ______(can/has been able to )save engough money to buy himself a flat.
3、I’ve told you before,you ______(can’t/are not able to)make phone calls without paying for them.
4、“Excuse me,” the man said.“_______(Can I/Am I able to) read your paper?”
5、After a few hours they ____（could/were able to)save the man from the sea.
6、We _____（could finally/ were finally able to)win the match because the other team become very tired and slow.