In the quiet darkness, I could hear someone _______ the door and go upstairs.
The number of foreign students attending Chinese universities ______ rising step by step since 1999.
The professor held the crucible the Bunsen flame when heating the substance.
12.—Most of my friends do the shopping online, —That’s really a good idea. Prices of goods _______ online can be lower than store prices.
—How do you find the film So Young directed by Zhao Wei? —_______.
The leader, together with some English teachers, _______ a chance to go abroad last year.