1. Great changes ________ in our city over the past three decades, which becomes the admiration of the whole nation.
A. have taken place B. had been taken place C. took place D. had taken place
2. When you have an intention to buy something, you must bear in mind that a good name of a product doesn’t ________ mean good quality of it.
A. possibly B. necessarily C. simply D. exactly
3. We had just covered half the journey _______ the engine failed and we could do nothing but wait for help.
A. before B. since C. when D. until
