Take the exam carefully, _ _ you won't get good marks.
| A．and | B．or | C．so | D．but |
.--Many people are wondering __________ in the forest.
--It’s reported that a burning cigarette bar caused it.
| A．when the fire happened | B．what caused the fire |
| C．how did the fire happened | D．why did the fire happen |
--Look! There is a lot of litter on the floor. Please ______.
--OK, we will.
| A．pick up them | B．pick them up |
| C．pick up it | D．pick it up |
Recycling means waste can be put to ______ and be brought back to life.
| A．danger | B．use | C．practice | D．advantages |
--Why don’t you get used to the life in Beijing?
-- ______ the crowded traffic ______ the high living cost. The only reason is the badly polluted air.
| A．Either…or | B．Neither, nor |
| C．Not only, but also | D．Both, and |
--What’s the result of killing the sharks?
--If the number of the sharks ______, the other ocean lives will be in danger as well.
| A．drop too little | B．drops too little |
| C．drop too low | D．drops too low |