He the book to the library if he it tomorrow.

The old man wouldn’t stay at home for a rest even if it rained. —- . He would feel sick if he stayed home for one day.

Listening is just as ______ as speaking in language learning.

Have you mended your shoes, Bob？—Yes, I ____ them twenty minutes ago ．

So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.