．No one knows exactly when our ancestors started talking，but new evidence suggests  _______might have happened a long time ago．

He doesn’t have _____furniture in his room --just an old desk.

It is believed that intelligence is to _____ extent _____ we are born with.

There is a subway in my hometown, but ________ existed two years ago.

We have been looking at houses, but haven’t found _____ we  like yet.