The sunspot came into its active stage, ____ that happens once every eleven years.

Mark Twin’s own story is as memorable as _______ he imagined.

I bought ______ for my son，but ______ for myself.

We will make ________ clear that we attach increased importance to all schools sticking to that guidance.

----Which do you prefer, noodles or dumplings? ----_________, thanks. I'd like some rice.