.---There is a lot of smoke coming out of the teaching building.---Really? It _____be a fire, most probably.
The meat tastes as though it ____ bad. Throw it off.
The manager always put ____ of his workers before__________.
Not until ____ finished my homework ___ to watch TV.
Today Xiao Li is absent ___the class. He ___ ill.
All things ___, the planned trip will have to be called off.