If you ________ Beijing Duck，I'd like to treat you to a meal at a famous duck restaurant．
| A．didn't try | B．don't try | C．haven't tried | D．hadn't tried |
It’s hard for him playing against me.I’ve got nothing to play for,but for him,he needs to win so_______.
| A．far | B．well |
| C．little | D．badly |
As the years passed,many occasions—birthdays,awards,graduations—_______with Dad’s flowers.
| A．are marked | B．were marked |
| C．have marked | D．had marked |
The biggest problem for most plants,which_______just get up and run away when threatened,is that animals like to eat them.
| A．shan’t | B．can’t |
| C．needn’t | D．mustn’t |
Polar bears live mostly on_______sea ice,which they use as_______platform for hunting seals.
| A．a;a | B．a;the |
| C．不填;a | D．the;不填 |
_______the silence of the pauses,we could hear each other’s breathing and could almost hear our own heartbeats.
| A．In | B．For |
| C．Under | D．Between |