题目内容
用适当的引导词填空
They are coming to us, ________ means that they have been refused else where．
Tom’s father, ________ is over sixty, still works hard day and night．
The engine is designed by Engineer Wang, ________ son is a college student．
He had failed in the maths exam, ________ made his father very angry．
________ is known to all, China will be an advanced powerful country in 20 or 30 years’ time．
