用所给词的正确形式填空。
1. You can't watch TV until you finish __________ (do) your homework.
2. Most parents don't think it is __________ (health) for children to stay up too late night.
3. At present, our spacecraft are too slow to __________ (carry) people to Mars.
4. The tunnel under the Changjiang River makes it much __________( easy)
to get to Pukou District than before.
5. It is said that many __________ (America) teenagers will come to watch
the 2014 Youth Olympic Games in Nanjing.
6. —Mum, today is your day, the Women's Day. Here are some __________ (flower) for you.
—It's very thoughtful of you. Thanks, Kitty.