依次填入下面一段文字横线处的语句，衔接最恰当的一组是但是，没有人会喜欢只有灰色的世界。 ，这也就是和谐。①灰色只有在和其他色彩搭配时，才能显示它的普适性，显示它的高贵和纯粹。②这世界充满生命活力，姹紫嫣红，千姿百态，万类霜天竞自由。③也正因为有了思想的高贵、纯粹，纷繁的世界才不至于俗不可耐。④因此，灰色又必须链接多彩的世界。⑤多彩保证了活力，而灰色提升着品位。⑥正因为有了生活的五彩缤纷，理论的灰色才不显得死寂；

He has made progress in his English, _______ makes his father very happy.

The novel is so badly written that I can hardly ________what the writer is trying to say.

most popular films in China thisyear, ________ was produced in this city

I don’t know makes her different from others.—Honesty, I think