The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.
Mr. Brown, please point out my spelling mistakes, _____.
________ a reply, he decided to write again.
Don’t worry. We’ll keep you _______ what happens.
Mr. Smith was quite satisfied with his new flat______ beside the West Lake Park and decided to settle down there.
_____, Carolina couldn’t get the door open.