______ apple fell from the tree and hit him on ______ head.
| A．An; the | B．The; the | C．An; 不填 | D．The; 不填 |
He devoted most of his time to his research, believing his hard work would___sooner or later.
| A．put off | B．take off | C．come off | D．pay off |
China, a country with 145 million elderly people, will remain _______ ageing society during this century, according to _______ Chinese population experts.
| A．/; the | B．an; / | C．an; the | D．the; / |
— Shall we walk around the park or go for a bike ride?
— _________. They are both good activities to me .
| A．Yes, I like them very much | B．It makes no difference to me |
| C．That’s all right | D．I’d prefer a bike ride |
John plays football __________, if not better than, David.
| A．as well | B．as well as | C．so well | D．so well as |
______ comfortably in his armchair, the old man enjoyed the light music over the radio with his eyes half ______.
| A．Seating; closed | B．Seated; closed | C．Sitting; close | D．Sat; closing |