There is _______ useful book on the desk.
It was not until dark____ he found____ he believed was the correct way to solve the problem.A that , that B that, what C when ,what D when , that
I like getting up very early in summer. The morning air is so good ______.
I think your health will soon ______ if you have a holiday on the seaside.
The book has been translated into thirty languages since it ______ on the market in 1973.
---He looks very hot and dry. --- So ________, if you had a temperature of 40℃.