—Have you ever been to Washington?---Yes, ____shall I forget ___ it for the first time.

Only when medical expenses are reduced      access to proper medical treatment.

The old couple have been married for 40 years and never once _______ with each other.

       that you didn’t care about this matter at all, I should not have wasted my time explaining it to you.

At the meeting place of the Yangtze River and the Jialing River __________, one of the ten largest cities in the world.