What is the equal idiomatic phrase "chase rainbows" in German?

Idon't understand what i am supposed to do, can someone translate ? it says: berechne. runde sinnvollbtw it's math: /

Ine gute partyfill in the blanks activity audio instructionslisten to the story and fill in the words you hear. die party ist toll. wir haben zwei basketballmannschaften, meine geschwister und unsere cousins. wir spielen (1) you answered gegen gegen unsere cousins. aber david ist nicht hier. unsere mannschaft spielt (2) you answered ohne ohne david. ich kann vater (3) you answered deus deusincorrect or extra word fenster in der küche (kitchen) sehen. dieter ruft (4) you answered im imincorrect or extra word mitternacht ein taxi. das taxi ist (5) you answered verty vertyincorrect or extra word die großeltern. die party geht (6) you answered bis bis 2 uhr morgens.

Read this excerpt from leah missbach day’s foreword to wheels of change. in efforts to restart the lives of those devastated by the crushing waves of the 2004 indian ocean tsunami, my husband, f. k. day, and i founded world bicycle relief (wbr). wbr works to provide access to independence and livelihood through the power of bicycles. during our work in sri lanka in 2005-2006, we put more than 24,000 new bicycles into the hands of those rebuilding their lives. since 2006, we have moved into africa where we currently work in zambia, zimbabwe, and kenya addressing oppressive poverty and the aids pandemic by mobilizing volunteer caregivers, students, and entrepreneurs with bicycles. what is the central idea of the excerpt?