The teacher asked the students _____ their homework.

The window _______ by someone last night.

Read the passage: \'Renewable energy sources like solar and wind now account for 30% of global electricity. However, their intermittency requires advanced battery storage systems to ensure consistent supply.\' What is the main challenge mentioned?

Choose the one-word substitution for \'Government by the rich\':

Teacher : Student is analogous to Doctor : ?

The teacher said, \'The earth revolves around the sun.\' (Change to Indirect Speech)