Produce a sentence which mentions all of these concepts: cheer, hill, sled

Two young children go sledding down a hill while an adult cheers them on.

Produce a sentence which mentions all of these concepts: age, book, room

this neutral coloured sitting room has plenty of books for all ages .

Produce a sentence which mentions all of these concepts: emit, fly, stream
An airplane flying below another one that is emitting a white stream.