It _____ last night., because the ground is all wet 

—Where ______ your food?—I only have two hamburgers. They ____ on the table. 

In China when the traffic light is red, you ________ cross the road.

--Guess what! Tan Weiwei failed in the last round of the Super Girl Contest.---How _______ it be? She is second to none in singing in my opinion.

---Did they have a good time at the party?---Judging by their smiles, they _________ have enjoyed themselves.