You have to wear a helmet and a life jacket for protection, just ___ you fall into the water.A. in case C. unless C. though D. as
—Liu Xiang has won the men’s 110 m hurdle final in 12.91 seconds. —___________!He never got such a good result before.
—Excuse me, ___________? —That’s $88 together,madam.
—Would you like me to help you with the maths problem? —___________ It’s a most difficult one.
—___________? —Something special?Great!I’m starving.
—Don’t forget to post the letter for me,will you? —___________.