All people, they are old or young,rich or poor,have been trying their best to help those in need since the disaster A even if B whether C no matter D however
Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
There’s no ________ from my bedroom window except for some factory chinmneys.
What a table! I’ ve never seen such a thing before. It is ______ it is long.
"On no account ____to feed the animals", the warning can be seen on the signboard in front of every cage.
Thinking ______ you know_______ in fact you don’t is a terrible mistake.