. _____ that they had made an important discovery in science.
| A．Littletheyrealized | B．Theyhadrealizedlittle |
| C．Littledidtheyrealize | D．Littlehadtheyrealized |
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 |