He was faced with the of whether or not to return to his country after he got the doctor's degree in America.
When the Marathon first came to Beijing in 1981, traffic was not _______ it is today.
Big boy _______ I am, my mother asks me to keep it in mind that under no circumstances _______ go to swim.
What he wants to tell us is that it’s three years _______ he moved here .
National parks are important for preserving many animals, which would _______ run the risk of becoming extinct.
We will _______ to Egypt for sighting until the situation there become stable.