After Jack had sent some e-mails, he _______ working on his project.
| A．had started | B．has started | C．started | D．starts |
Selecting a mobile phone for personal use is no easy task because technology ____ so rapidly.
| A．will change | B．has changed |
| C．will have changed | D．is changing |
The leader of the factory told us that very little ___was made of the waste material in the past.
| A．cost | B．value | C．use | D．matter |
Please tell me the way you thought of _______ to stop smoking.
| A．make up your mind | B．to make up your mind |
| C．making up your mind | D．to making up your mind |
His photos appeared ______ in national famous magazine at that time.
| A．properly | B．fluently | C．frequently | D．sincerely |
We must get up early tomorrow，______ we’ll miss the first bus to the Great Wall．
| A．so | B．or | C．but | D．however |