＿＿＿＿＿he come, the problem would be settled. 

 Look! There’s no light on—Sara _____be at home.

All the doctors in the hospital insisted that he________ badly wounded and that he ______at once.

Don’t play with dog, Jack, for it _____ be dangerous at times.

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