It is ___ to observe traffic rules.
| A．of great importance for us | B．important to us | C．great importance of us | D．of great importance to us |
Tom is very happy in China during this period because his Chinese ________ every day.
| A．has improved | B．is improving |
| C．improved | D．is improved |
—I guess you can buy such a smart phone for 300 dollars.
—I could just two months ago，but the price ________ by 20%.
| A．went up | B．had gone up |
| C．has gone up | D．goes up |
The London 2012 Olympic Games marks the third time that London ________ the right to host the modern Olympics.
| A．had had | B．has |
| C．had | D．has had |
—Help me out in the kitchen and I ________ you to a fresh pot of coffee.
—Sounds good.
| A．will treat | B．treat |
| C．am treating | D．have treated |
Because the shop ________，all the Tshirts are sold at half price.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |