I am afraid she never participates in any of our discussion,____?[ ]

Speaking of all the songs she has sung，I think this is probably her ______ one.

Bill`s mother is ill. —- __________.

I hear that our school team won the game. ________ it be true—It ________ be true. I noticed all of them looked unhappy when they came back.

It’s important for him_____ English well.