Look! If we had begun to do the work yesterday morning, we _______ ourselves just like them．

The doctor insisted that the patient _______ seriously ill and that an operation _______ in no time. 

 Although this         sound like a simple task, great care is needed.

—Who has made a mess in my room?—Who else       it but your naughty son?

It is usually not quite cold in this area in March, but sometimes temperature __________be very low.