.If we humans beings continue to waste and destroy natural resources without using _____ energy, such as the energy from the sun, wind and water, our earth will be done for.

Mary is hard-working. She works harder than classmates in her class.

It is very kind _______ you to help me withmy housework It is hard _____me to do allthe work

It’s wellknown that the world economic situation will get worse________. [ ]

He speaks French because he once lived in France —Really? How long _____ there?