What’s _____most useful invention in the 20th century? —_____ computer, I think.

Mary, is that umbrella ______?— No. It belongs to Jane.

Han Han is a popular writer. His new book will _________ this September.

So far we have done a lot to build a low-carbon economy, yet it is still _________ ideal. We have to work even harder.

Everything will ____ soon. Just be optimistic and confident.