--Have you called Mr Johnson’s office?---Yes. He ____back before tomorrow noon. So he can attend our meeting on time.
In time of serious accidents, _______ we know some basic things about first aid,we can save lives.
The world is changing fast.I strongly believe that one will easily fall behind _______ he keeps on learning.
The traffic is very_______.It’s quicker to walk there.
He has read two novels _______.
—I think he is very wise. —No, he is _______ than wise.