The new computers ______ to the village school. Do you know?—Yes. I heard of it.

The islands developed on their own for 80 million years and ________ have many rare animals found nowhere else.

She looks very sad. I want to help her, but I just don’t know ____ to do it.

will it take us to fly to Hainan and will the trip to Hainan cost us?

Jim, Tom is looking for his English book. Is this ______?—No, that is______. I don’t know wherehisis.