______ is known to us all is that China has launched Shenzhou V spaceship successfully.
However difficult you find to arrange your time, it will pay off in the long run.
Walter offered us a lift when he was leaving the office, but our work ______, we didn’t accept the offer.
ThejobprovedtobemuchmoredifficultthanI______.
It was 300 hundred years ago _______ this historic temple was built by a wealthy Mandarin.
The Sanlu Milk Powder event is a clear indication that food safety is a big problem; nobody can ___ all foods are secure to us, but we are sure that the situation is turning for the better.