India’s space agency _______ its first pictures of Mars as its satellite begins work a day after entering orbit around the Red Planet.

What do you think of it?—Well，it’s worth doing ________ the result is satisfactory.

Having retired from business,he nowhimself with the welfare of the disabled and lives a meaningful life. [ ]

Lisa doesn’t know ______ she and her friends can do to help the little boy ______ parents have left their hometown for making money.

_______ the man — He’s my uncle.