Children’s brains cannot develop properly _________ they lack protein.
My flowers grew well all the time. _________, your dog destroyed them all!
By the end of last month, ten primary schools _________ with the help of Project Hope.
There are many good stories about the Long March, _________this is the most instructive.
Linda’s parents died when she was a baby, and she was _________by her aunt.
Li Ming is clever, honest, and hard-working. _________, he is a good student and we should learn from him.