When the woman found her borrowed valuable necklace (项链) ______, she felt______ the world was at an end.
| A．was missing; unless | B．was lost; as if | C．was missed; whether | D．was gone; as if |
He is only too ready to help others, seldom, ________， refusing them when they turn to him.
| A．if never | B．if ever |
| C．if not | D．if anything |
A recent study has found that the number of smokers ________ sharply over the past five years.
| A．is increasing |
| B．are increasing |
| C．has been increasing |
| D．have been increasing |
How close parents are to their children ________ a strong influence on the development of the children's characters.
| A．having | B．had |
| C．has | D．have |
—Was it at 11 o'clock ________ your father came back last night?
—Yes, he is always coming back so late.
| A．that | B．while |
| C．when | D．until |
Scientists are still wondering ________ the Egyptians built the pyramids so long ago.
| A．how it is that | B．how is it that |
| C．it is how that | D．that how it is |