The other day, my brother drove his car down the street at ________ I thought was a dangerous speed. 

We cannot figure out ________ quite a number of insects, birds, and animals are dying out.    

As a new diplomat, he often thinks of_____- he can react more appropriately on such occasions. 

Is this hotel _____ offered you a job ______ you stayed the first time you arrived here?

All of us were so excited at the news ______ we would be sent abroad to study for two years ______ we jumped with joy.