We ________ on this project for four hours. Let’s have a rest.[ ]

Under no circumstances ________ the door to the Data Centre unlocked.—I promise I’ll be more careful in future.

Doctors and nurses tried their best to make the patient feel _________ .

It’s going to rain.Tom，will you please help me________the clothes on the line

_____ you _____ your homework yet—Yes, I _____ it ten minutes ago.