Coach，can I continue with the training?—Sorry，you can’t________you haven’t recovered from the knee injury.

Jack, what about the lecture? — It is the most inspiring lecture that I _________ since I came to this university

ould say sorry to her, Tom— ______, but it’s not going to be easy

―Have you finished your composition already? ―YesI _________ it in twenty minutes

Look! There are lots of ________ birds flying over the trees.