She could speak both English and French, but _________ is hard to believe.
Liu Hulan was so brave that she showed no signs of _____ to the enemy even under torture(拷问) .
Believe it or not, there is no such thing __________ “standard English”.
We are happy that the project has been finished ahead of _______.
It was in the lab __________ my father did the experiment yesterday evening.
The children asked her mother ______________ go out to play tennis.