It is only _______ you understand what your parents do for you _______ you can improve your relationship with your parents.
His parents died in the strong earthquake, so he was ______ in the SOS Village.
Taking care of children calls for your time, abilities, patience and emotions. _____, it is not a simple thing.
All the members of the WTO should follow the ______ of trust and fair(公平) trade.
In our class there are 46 students, ______ half wear glasses.
Tom took a taxi to the airport, only ______ his plane high up in the sky.