She looks sad. Could you please tell me ____ that prevents her from being as happy as before?
The last time we had great fun was _____we were visiting the Water Park.
It was along the Mississippi River ____Mark Twain spent much of his childhood.
_____ their hats into the air, the fans of the winning team let out loud shouts of victory.
No decision____ about any future appointment until all the candidates have been interviewed.
The companies are working together to creat ______ they hope will be the best means of transport in the 21st century.