What a hardworking doctor! He _________ has time to play with his son.– That’s true. Even on Sundays he is busy with his work.

The plane from Beijing to Hong Kong ________ half an hour ago.

There ______many restaurants in town, but they _________ eat the food there at first.

No matter how ______，scientists are eager to know more about it by exploring.

My friend, Li Ling invites me ______ her home. [ ]