He started to learn English in 1990 and in the years ________ he kept on using it in his work.
.________beat Xiao Ming black and blue is not known.
_______ I can see, there is only one possible way to keep away from the danger.
He is a ________child and his parents are ___________ with him.
These rivers should be prevented ___________.
He found himself _________ in a hospital bed.