The old man _______  up late,but now he _________ up early.

---Have you finished the report?---Oh, sorry. It was so noisy in the office that I couldn't _______ down to write anything.

—The head teacher said we had only three days to finish the project.—Don't worry. We have already ________ two thirds of it.

It usually takes courage to _____ an invitation.

With the college entrance examination approaching，students should________to stay energetic.