Look! There is a whole crowd of people over there．Go and see what __________ and if it is a bargain，buy it．

--Remember the first time we met?---Sure. You _____________ the novel Gone With the Wind in the library.

I feel so excited! At this time tomorrow, I ________ by camel with local guides in Northern Africa. 

Measures have been taken to prevent the accidents, but much _____ for more improvement.

—What’s the price of petrol these days?—It ________ frequently since last year.