. —Why didn’t you response to their greeting? —Sorry. I ______they ______ to me.
Such good use had beenhis spare time_________ his English has improved a lot.
Was it from Libya ______ wars suddenly broke out _____ we managed to rescue the Chinese working staff?
Medicine should not be kept where it is _______ to children.
Some cyclists make the ______ that traffic laws do not ______ them. It is not true, _____.
Due to the widespread ______ of this medical technology, more diseases can be discovered and treated at an early stage.