As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
Most of the visitors were happy just sitting around in the shade, _________ it had been a long, dusty journey on the train.
| A．for | B．so | C．but | D．Or |
— Doesn’t he lose heart even if the experiment hasn’t been working out?
— ________. Nothing defeats him.
| A．It depends | B．You bet |
| C．By no means | D．Not a little |
Malaysia Airline Flight MH370 seemed to have been _______to only a mystery after so long and hopeless a search.
| A．reduced | B．formed |
| C．trapped | D．absorbed |
I don’t want to go shopping. ________, it’s raining heavily outside.
| A．Therefore | B．Besides | C．Somehow | D．Otherwise |
Susan stayed awake in bed, watching the heavy rain beating ________ the windows.
| A．on | B．above | C．against | D．across |