The cause he had devoted himself to __________a perfect success.

— Have you handed in your papers?
—Yes, we have. I guess they ___________ now.

The company _______ a rise in salary for ages but nothing has happened yet.

—Why does the river smell terrible?
—Because large quantities of water__________．

—Tom, you didn’t come to the party last night?
—I ______, but I suddenly remembered I had homework to do.

As your spoken English gets better, so_____ your written English.

With more forests being destroyed, huge quantities of good earth _____ each year.

—Would you like to join us in playing the game?
—I’m sorry, but my homework ______ by now.

Great as Newton was, many of his ideas _____today and are being modified by the work of scientists of our time. 

—What were you doing when Tony phoned you?
—I had just finished my work and ___ to take a shower.