I didn’t meD. couldn’t

Not until he had left his friend _______ how important friendship was for him.

e me, sir. My visa is due at the end of this month. Can I _____ it—Sure. You can just go to the Public Security Office in our city to fill in some forms.

We don’t write to each other regularly，but we do keep intouch by telephoning _____.

I don’t know this part of the countryside well, so we’d better ___ the path