She looks sad. Could you please tell me ____ that prevents her from being as happy as before?
Successful people always make ________ preparations for any potential setbacks.
With a huge amount of food ________,all of the staff are busy preparing for the dinner tonight.
It was ________I went there ________I began to know something about the matter.
________ got on the train when it began to move.
Looking at her _______ looks,we were _______.