In addition to keeping on taking ________ exercise, Alan is also going on ____ diet to lose weight.
| A．an; a | B．an; / | C．/; / | D．/; a |
If your race car isn’t insured, you maylosing everything when it hits something solid．
| A．delay | B．deny | C．avoid | D．risk |
AIDS control and prevention is ato China as well as the whole world．
| A．surprise | B．challenge | C．reaction | D．threat |
tomorrow, our ship will set sail for Macao.
| A．However the weather is like | B．However is the weather like |
| C．Whatever is the weather like | D．Whatever the weather is like |
She wants her paintingsin the gallery, but we don t think they would be very popular.
| A．display | B．to display | C．displaying | D．displayed |
the safety of gas, the government has checked the city’s gas supply system thoroughly.
| A．To ensure | B．Ensuring | C．Having ensured. | D．To have ensured |