As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
— Could you meet me at the airport? — I'd like to,but I'm afraid I ______ a very important meeting when you return.
The science of computer, ______ rapid progress has been made in recent years,plays a very important role in our daily life.
—John is said to have _____ missing since last week. Has he gone somewhere? — Not really. He_______ his newly-bought apartment.
— It’s a long time ______I saw you last. — And what is a pity now that it will be a long time______ we see each other again.
In order to attract more online shoppers on Double-Eleven Day, the owners of Taobao promised that they would have those ordered goods _____ to their homes in less than 3 days.