in the study lost in thought for a long time, I suddenly realized that nothing in the world remains .
—Which module is the most difficult in this book?— I think _____ module.
— Where is your mother? —She ________ the shop. She’ll be back in an hour.
—Do you know Peng Li yuan?—Of course, she is First Lady of China, famous singer.
If only I ________ driving before.
It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.