单项选择题
All the attempts to rescue the child from the burning building were（）．He died soon afterwards．
A.in placeB.in returnC.in vainD.in order
单项选择题 This is（）second time that I have failed，but I will never give up，I will try（）third time．
单项选择题 There is（）book over there and（）cover of（）book is red．
单项选择题 Riding bikes has advantages（）driving cars（）many aspects.
