When she was in trouble, I did what I could to help her. my help, she wrote me a letter of thanks.
On________ second thought, I decided to give him________ second choice.
“39 Steps”is one of the most exciting films_________ directed by my brother.
----Have you finished the book ? ----No, I’ve read up to _______ the children discover the secret cave. .
Living in the central American desert has its problems, ________ obtaining water is not the least .
---Alice, why didn’t you come the other day ? . ---I______, but I had an unexpected visitor.