In today’s competitive economy, ________ everyone is trying to do more with less, you’ve got to figure out a way to profit from the very beginning.
He ______ be a history teacher.
This book ______ Tom’s father’s, because his name is on the book.
This question is ______ easy, all the students can answer the question.
I don’t know _________.
When we practice speaking English, we often end up _____ in Chinese.