—What’s the matter? It seems you’ve caught a cold.
—Oh, I’m just too tired.
| A．as if | B．ever since | C．because | D．when |
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 |
________ about the man wearing sunglasses during night that he was determined to follow him.
| A．So curious the detective was |
| B．So curious was the detective |
| C．How curious was the detective |
| D．How curious the detective was |