The teacher told us that the problem was not _____ easy and that we should think _____ over carefully.
I really appreciate ______ to relax with you on this nice island.
It seemed that he was ______ losing his life.Luckily, he was ______ in the end.
You needn't have taken a taxi. Why didn't you catch the last bus ______ I told you?
David caught a bad cold last Tuesday. Luckily, the cold didn't ______ his examination in physics.
-What are you worried about?-Tom didn't respond ______ any of my e-mails. Something must have happened to him.