——Do you know the answers to these questions asked by your little brother?——Of course not, but I can’t let him know       .

Though he has worked for years, there is ___ furniture in his room

The threats to the health of astronauts in space are very different from ______ on earth. 

I cannot understand why Steven bought so many watches but never wears 　　　 of them.

—I’m leaving for the exam. Bye, Mum.—Well, make sure you’ve got ________ ready.