So far all cloned animals have suffered from some different serious disorders，________ dying soon after birth.
| A．many of which | B．many of whom |
| C．many of them | D．many of that |
— Tom fell off the bike yesterday, but he is all right now.
— What a lucky dog! He _________ himself badly.
| A．should injure | B．could have injured | C．should have injured | D．might injure |
________they were often separated due to work, they have understood and supported each other and continuously shown concern for each other.
| A．When | B．Although | C．As | D．Because |
Everything seems to be going______for the first two weeks after I moved to Shanghai.
| A．smoothly | B．vividly |
| C．frequently | D．generally |
The hunter shot at the birds ______ the big tree, only to shoot ______．
| A．on; nothing | B．on; neither | C．in; none | D．in; no one |
—How long did David work here?
—For half a year, he didn't leave much_______on us.
| A．expression | B．instruction |
| C．conclusion | D．impression |