I don’t know ________ a show. Can you tell me?

How was your trip? – Great. It was the most interesting tour __________ I had ever had. [ ]

The weather in Hong Kong is quite different from __________ in Beijing.

My brother is _______ homework. He often ______ homework at homework.

To be well-informed , we should be ______ communication _____ each other about what happens to us.