—I’ve got an “A” in the examination. —That’s a good ______. You will surely win a second.

Dogs are our good friends as they can keep ______ with us when we are lonely．

 Those black clouds are a sure _____ that it’s going to rain. 

This restaurant has become popular for  its wide ______of foods that suit all tastes and pocket.

 —What do you think will be the future of your new invention?—I’m sure it will have many different _________ in the industry.