Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
A．into; from B．towards; towards
C．out of; from D．through; through
There’s no ________ from my bedroom window except for some factory chinmneys.
A．view B．scene C．sight D．scenery
What a table! I’ ve never seen such a thing before. It is ______ it is long.
A．half not as wide as B．wide not as half as
C．not half as wide as D．as wide as not half
"On no account ____to feed the animals", the warning can be seen on the signboard in front of every cage.
A．allow visitors B．visitors are allowed
C．are visitors allowed D．are allowed visitors
Thinking ______ you know_______ in fact you don’t is a terrible mistake.
A．that; that B．what; what C．that; what D．what that
He is only too ready to help others, seldom, ____, refusing them when they turn to him.
A．if never B．if ever C．if not D．if any
