Ittook_____buildingsuppliestoconstruct these energy-saving housesIt took brains, too[ ]

Professor Wang ________in our school till next Sunday

Mum, my teacher Miss Li.

His writing is so confusing that it’s hard to make out _______ it is that he’s trying to express.

The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental _____ and severe cold.