Not knowing how to grow crops，the primitive people had no ______ but to gather the fruit and hunt animals for food.
| A．conception | B．command | C．virtue | D．alternative |
Feathers fall to the ground slowly,________ stones fall much faster.
| A．but | B．however | C．while | D．yet |
The children are seldom encouraged ________up late at night preparing their lessons,if ________.
| A．staying;once | B．to stay;ever | C．staying;sometimes | D．to stay;never |
Though great efforts have been ________on her study,Annie can’t still make any improvements,which makes her parents greatly________.
| A．made;surprised | B．done;surprising | C．taken;surprised | D．given;surprising |
The population of the city ________from less than half a million in 1949 to over two million.
| A．have increased | B．has increased | C．have improved | D．has improved |
—I’m going to the office.
—________ you’re there,can you get me some stamps?
| A．As | B．While | C．Then | D．Where |