---Tom, keep your_____ on your studies. --- Sure, mum. I'll keep that in_____.
I have told you the truth. ________ I keep repeating it?
How long can you ________ your breath underwater?
By the side of the Bird’s Nest , completed in 2008.
___________ certain that his invertion will lead to the development of production.
How wonderful! The _____is made of _________.