I _______ you a ring if I hear anything.
People develop _______ preference for a particular style of learning at _______ early age and these preferences affect learning.
—Is the chemistry experiment easy? —______. I’ll just do my best.
The number 5.12 is a special number,__ ,I think, that will be remembered by Chinese people forever.
The country has already sent up three unmanned spacecraft, the most recent__at the end of last March.
_____ for his action on the playing field ,but he is also famous for the things that he does off the playing field.