Do you know if _______ back next week ? If he ________ back , please let me know .

Where is Grace?—She __in the yard.

Is this park______you’ve visited recently? — Yes, it’s the most beautiful one I’ve ever visited before.

To my mind, she is the most wonderful teacher that I’ve ever known, _________ is able to get across to her students ________ she really thinks and means.

Do you know whether scientists have ________a good way to deal with Influenza H7N9 or not?—Not yet .But they’re trying their best.