Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
| A．exposed | B．to expose | C．exposing | D．being exposed |
I hadn't seen her for 10 years, but I ____ her at once.
| A．realized | B．recognized | C．knew | D．found |
——What a fine day! Shall we go picnicking?
——______. But we need to be home before six o’clock for the football match.
| A．Have a nice time | B．Pardon me | C．That’s great | D．You are right |
It was freezing last night, so they had the fire___ all night long.
| A．to burn | B．burned | C．burn | D．burning |
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 |