下列各句中，表达得体的一句是

This programme is a ___TV show, so you cancall the station directly to vote for your favouritesinger.

The science of computer, ____ rapid progress has been made, is the most important of all.[ ]

We can hardly believe what she says because she is___changing her mind.

﹣How often do you have a school trip this term﹣_____．Since several accidents happened to some schools，all the school outdoor activities have been asked to stop．