Middle school students hardly know anything about shopping online, __________ they— ________. It’s very popular with teenagers.

nd, foreign fishing ships will have to request permission from ports that are able to _____ them.

The final exam ____, your parents will not probably allow you to listen to music.[ ]

I can’t see the blackboard. There is a tall boy me.

下列各句的句式与其他三项不同的一项是（ ）