At __________ present we are going through a hard time, but I'm sure __________ things will get better in the near future.
–What do you think the noise was? --It ___________ a cat.
Do you know the _________ of the saying I just quoted?
He is very stubborn, it is impossible to argue _____________ what he doesn’t want to.
It was playing computer games______ cost the boy plenty of time_____ he ought to have spent doing his homework.
The ecologists urged measures _______ to protect the wildlife.