This photo of mine was taken __________ stood the famous twin-tower before the 9.11 event.
Would you please go and ______some water for me? I am thirsty.
A lot of meetings were ______because of the dangerous disease.
We enjoy______the moon in the open air on the Mid-autumn Day.
----Do you think Jim will pass the Chemistry exam? ----Sure. He ______a lot of time on it.
He ______the bus and found a seat next to the window.