【推荐1】Though in her _________(seventy), she still worked 8 hours a day in the pet shop.（所给词的适当形式填空）

【推荐2】Though the old man is in his ____________ (ninety), he is still very healthy. (所给词的适当形式填空)

【推荐3】Biological systems have been doing this for __________ (billion) of years. (所给词的适当形式填空)

【推荐1】用所给词的适当形式填空
1. If your personal information is stolen, it is likely to be used by some __________（crime）to steal your money out of the bank.
2. Nanjing has excellent air and rail __________（connect）to the rest of the country.
3. In fact, I know that there will be plenty of   __________（disagree）and different ideas about the project.
4. I was an active   __________（participate）of all kinds of sports activities.
5. If you’ve got friends or family coming to stay, be sure to give them the full   __________（treat）.
6. The shop owner never sold cigarettes to teenagers __________（illegal）.
7. I can turn the television off if you find it a __________（distract）.
8. After leaving hometown so many years, she had changed so much beyond my   __________（recognize）.

【推荐2】His work was exhibited in the best __________(gallery) in America, Europe and Asia. (所给词的适当形式填空)

【推荐3】It is our ________（responsible）to take care of the old. （所给词的适当形式填空）