My grandfather keeps healthy by ______ for half an hour every morning.
| A．working out | B．acting out | C．taking out | D．looking out |
Over the past decades, sea ice in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
Life is like a long racewe compete with others to go beyond ourselves.
| A．why | B．what | C．that | D．where |
I likein the autumn when the weather is clear and bright.
| A．this | B．that | C．it | D．one |
It was the long March Rocket 2F, as reported, sent Shenzhou VI spaceship into space.
| A．which | B．what | C．that | D．as |
Don’t leave the waterwhile you brush your teeth.
| A．run | B．running | C．being run | D．to run |