There are some health problems that, when ____ in time, can become bigger ones later on.
| A．not treated | B．not being treated |
| C．not to be treated | D．not having been treated |
In this factory, suggestions often have to wait for months before they are fully _____.
| A．admitted | B．acknowledged | C．absorbed | D．considered |
After a long walk, they______ pass over the mountain.
| A． could be able to | B．can | C．would | D．were able to |
—I hear Mike refused to tell the truth and was taken away by the police.
---Where did you ____?
| A．pick it up | B．put that up | C．make that up | D．take that up |
—Have Mike and Tina sold out all of the English storybooks?
---Yes,completely.____ is left.
| A．None | B．Nothing | C．No one | D．Neither |
—Have you ever been to Washington?
---Yes, ____shall I forget ___ it for the first time.
| A．however; visiting | B．never;visiting | C．never;to visit | D．forever; to have visited |