There was a _____ look on his face. He found what the expert said too difficult to understand.
Progress so far has been very good. ______, we are sure that the project will be completed on time.
Eugene’s never willing to alter any of his opinions. It’s no use ______ with him.
I regret ______ that we have no news for you.
When he saw a little boy ______ in the river, he took off his shirt and jumped into the water.
—What do you think of the book? —Oh, excellent. It’ s worth ______ a second time.