Where is Mr. Green now I haven’t seen him for a few days.—He _________ to Hong Kong.

It’s easy to make friends, but it’s difficult to keep the ________ longer.

Would you like to talk with your father or mother, Liu Mei— We don’t have the same topic(话题).

All ______ is needed is a supply of oil.

The workers were so tired that they fell asleep where they ______without undressing