Nowadays a lot of teenagers have been _____ surfing the Internet.[ ]

Only in this way ______ progress in your Japanese. [ ]

— What’s that noise, John?— Sorry, Linda. I forgot to tell you. The school library ______.[ ]

Youshould never base anything on atheory that _________ impractical in practice

Where did the professor made the speech yesterday—It was in the hall ________ the students often have a meeting ________ the professor made the speech yesterday.