—May I help you? You seem to be having some problems. — , thanks. I think I can manage.
Since the beginning of the vacation,I______ across the country,and my next stop is the Wuyi Mountains.
Once again he didn’t hand in his homework _____ he had been given enough time to do it.
---They live on a busy road. --- There ______ be a lot of noise from the traffic.
._____ the chapter four times, I finally understood the author's theory.
Ann ______ here any more.She left last month.