I have an appointment _______ Dr.Brown,but I need to change it.
Maybe you have been to many countries , but nowhere else ___such a beautiful palace.
I failed in the examination last term and only then ____ the importance of studies.
Only when your identity has been checked ,.
The old couple married for 40 years and never once____ with each other.
—How was the 2008 Beijing Olympic opening ceremony? —________ that the whole world was attracted.