Hi, Lydia. Are you going to the concert on Friday?— I’d like to. But there are so many problems_______.[ ]

idea of low-carbon life is now _____accepted, more and more people travel by public transport.

It is good for elderly people to be _________ involved in community service

You’d never heard of it before I told you,________?

He made a promise that he would_________us with dinner the next day,but he broke his word.