When first __________ to the market, the computer software was not a success due to its complexity in operation.
| A．introducing | B．being introduced |
| C．introduced | D．to be introduced |
Our class _______ of thirty-two boys and twenty-three girls.
| A．composes | B．concludes | C．contains | D．Consists |
—What about seeing the new movie at the theatre tonight？
—
| A．Never mind. | B．Not at all. | C．Why not？ | D．So what？ |
Officials believe that more than one person _____ for the big fire.
| A．is to be blamed | B．should blame |
| C．should be blaming | D．is to blame |
While cleaning the snow on the road, _________.
| A．a wallet was found on the ground. | B．a wallet appeared on the ground. |
| C．I found a wallet lying on the ground. | D．I found a wallet laid on the ground. |
--- Did you understand what the teacher said ?
---Yes! She explained the text in detail to make her lessons __________.
| A．easy understood | B．easily to understand |
| C．easily understood | D．easy understand |