We have made _______great progress in the medical field, but ______ progress we have made is not enough.
Who do you suppose_____ wants to go with to the cinema____ in the 1990’s.
The reason_____ he explained to us was ______he was ill. for; thatB. for ; because C. why; that D. which; that
.Niagara Falls is a great tourist _____, drawing millions of visitors every year.
.YaoMing, as we know,_____ like to play basketball.
--You are always full of ____. Can you tell me the secret? --Take plenty of exercise every day.