A man may usually be known by the books he reads _____ by the friends he keeps.
When he heard the little girl’s cry, he immediately came to ___________.
Einstein liked Bose’s paper so much that he ___ his own work and translated it into German.
The sentence wants ____ once more.
--Why are you so anxious? --It isn’t your problem ____.
The two sportsmen congratulated each other ____ winning the match by shaking hands.