Cloning plants is straightforward cloning animals is very complicated .
| A．so that | B．although | C．while | D．as if |
He has done so many bad deeds that we should never let him ___it .
| A．get away from | B．get away with | C．get out | D．get over |
.The old house ____ the old man of his happy childhood .
| A．remembers | B．reminds | C．recognizes | D．retells |
During the the Qingming Festival many Chinese will go to clean the tombs and light incense _____ their ancestors .
| A．in memory of | B．in honour of | C．in hope of | D．in return for |
The letter he had been looking forward to ____ at last .
| A．arrive | B．arrives | C．arriving | D．arrived |
As we drew closer, I could see a whale ____________ by a pack of about six other killers.
| A．attacking | B．being attacked | C．attack | D．to attack |