____ is it for the dance lesson— It’s 100 yuan.

You haven’t said a word about the design ,MikeWhat’s your idea?—-I’m sorry I _______ about something else just now

Four teams of three people would compete ______ the game and the winners would receive a free vacation

There was something wrong with the network, or the e­mail ________ earlier.

Mr Lin’s comments were very difficult to follow because they were ______related to the topic under discussion