There is no exact definition of word “happiness”. People are happy for all sorts of reasons.
| A．/; the | B．a; the | C．the; a | D．/; a |
Everyone here will thank the firefighters for the things they did to prevent fires ________the environment safer.
| A．to make | B．make | C．making | D．from making |
She always goes swimming ________cold it is.
| A．however | B．no matter | C．although | D．whatever |
—We'd like you to start work tomorrow if possible.
—I'm sorry, but I can't possibly start until Monday.________？
| A．Do you agree with me | B．Is that a good idea |
| C．Do you think I'm right | D．Will that be all right |
Look out! The train ________.
| A．leaves | B．is leaving | C．has left | D．left |
Do you think exercise can keep us ________？
| A．well | B．good | C．fit | D．fine |