Most of her spare time ______ , she still kept on her research in the laboratory.
There's no __________in the way they do their accounts(记账).
There are too many difficulties for us __________. Wereally don't know __________ to do.
You'll find taxis waiting at the bus station __________ you can hire to reach your host family.
Thetest measures mathematical __________.
This piece of news was __________ economic and social problems.