The big secret in life is that there is no big secret. __________ your goal, you can get there if you’re willing to work.

Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill

I have_____ to tell the class.

Don’t worry. His temperature will ______ back to normal（正常）if he takes this medicine.

They were so far away that I couldn’ttheir faces.