The scientist has made quite a few discoveries, ______ of great importance to the whole world.

I want to know ________ next week，Mum.—If I know about it, I will tell you at once.

I often go to the movies _____ my parents _____weekends.[ ]

____ is the weather ____in Beijing?

____the sketch of Xiao Shenyang made a _____has been known to us all.