Sustainable development is long-term ________which focuses on the environment and ________ natural resources.
The light ________ and the room became complete dark.
--Let’s go for a walk in the garden. --_______ , but I need to do the washing-up first.
Don’t leave the water ______ while you brush your teeth.
Our class teacher is still on ______ holiday, so our monitor will be in ______ charge of the meeting today.
—How did you find your visit to Qingdao, Joanna?—_____________.