afford；holes；progress；thousands of；safe

（1）China has made great　　in the past forty years．

（2）People planted　　trees in the suburb of the city， Urumqi．

（3）Nowadays， everyone feels very　　and convenient in the streets of different cities in Xinjiang．

（4）In the book A Brief History of Time， the famous British professor Dr． Hawking describes his theory of black　　．

（5）Many families are richer now so they can　　a big car like SUV．