With so many things _______, we haven’t decided on the final plan yet.
| A．considered | B．having considered | C．to consider | D．considering |
At times the balance in nature is____, resulting in a number of possibly unforeseen effects.
| A．confused | B．puzzled | C．disturbed | D．troubled |
If I ruled the world，I would________ the world________ everything that is bad.
| A．get rid of；by | B．be rid of；by | C．rid；of | D．get rid；of |
Only after the woman had her own child ______how difficult it was to be a mother.
| A．she realized | B．had she realized | C．she had realized | D．did she realize |
We ________ the problem for a long time, but we didn’t reach any agreement.
| A．argued | B．explained | C．shared | D．communicated |
China sent up two manned spaceships and they were also great scientific _______ in the world.
| A．campaigns | B．surprises | C．achievements | D．discoveries |