Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.
| A．pile up | B．build up | C．keep up | D．pull up |
Emily is working hard to be sure not to fail on her first ______.
| A．plan | B．purpose | C．attempt | D．desire |
Without electricity human life ______ quite difficult today.
| A．is | B．will be |
| C．would have been | D．would be |
Little Johnny felt the bag, curious to know what it _______.
| A．collected | B．contained |
| C．loaded | D．Saved |
— I’m still working on my project.
— Oh, you’ll miss the deadline. Time is ______.
| A．running out | B．going out |
| C．giving out | D．losing out |
We hadn’t planned to meet. We met ______ chance.
| A．of | B．in | C．for | D．By |