Every time she was in trouble, she went to him for help, as he said he ________ do anything for her.
Some animals in _____ wild are now in ______ great danger of disappearing because of human activities.
--- Have you moved into the new house?--- Not yet. The walls ______.
---How could you say that?--- ______. I didn’t mean to hurt you.
If the opportunity would ______, hold on to it and don’t let it go.
Last summer I took a course on ______ poisonous gases.