77. The old man received a lot of respect for his ________ character.
______ the warning message, more visitors might have been trapped in the flood.
______ to sunlight for too much time will do harm to one’s skin.
It’s a difficult skill to master, but ______, it will benefit you for the rest of your life.
My grandmother has kept the photo ______ she can see it every day for a couple of decades.
Bob is in a hopeless situation, ______ we will keep a very close eye on.