It was at 5 o'clock ___________ the visitors finally arrived at Pudong International Airport.
—How about going out for a picnic on Sunday morning? —Hmm.___.The weather is very good these days.
Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.
.It is said that the early European playing-cards ______for entertainment and education.
31.The company had about 20 notebook computers but only one third _______used regularly . Now we have 60 working all day long.
The young girl sitting next to me on the plane was very nervous.She ______before.