---You effort is sure to pay __________
---Thank you for you encouragement.
| A．off | B．back | C． for | D．down |
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 |
We have to give the users something new ________ what we’ve already offered, which is the only way to broaden the appeal of the website.
| A．regardless of | B．in addition to |
| C．in exchange for | D．according to |
Only latelyabout the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.
| A．the public have known | B．were the public known |
| C．have the public known | D．the public knew |
Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.
| A．frequently | B．significantly | C．steadily | D．consequently |
Comparison may make something appear more beautiful than it is when ______ alone.
| A．to see | B．seeing | C．is seen | D．seen |