I think you should go back to your ______ plan, which is much more practical than the present one.

In Beijing，you can see many people wear masks（口罩） if they _______ out on foggy days．

Tom ___downloaded a virus into his computer, hecan not open the file now．

It’s reported that many people were hurt in Kunming Terrorist Attacks (恐怖事件)on March 1st.— _______ bad news!

My teacher _____ me the key to the classroom but I’m afraid I _____ it