用括号里的词的正确形式填空。

1. People must be _________ (real) _________ (grate) to you.

2. We are the _________ (luck) ones.

3. We hope _________ (celebrate) Christmas by ________ (send) cards to each other.

4. We should try our best _________ (help) them.

5. The problem of __________ (blind) is very serous. We will solve it soon.

6. Tom hopes that more people can send _________ (donate) to ORBIS to support their work.

7. It's very _________ (please) to meet friends and chat with them in the park.

8. They can make modern machines with the _________ (develop) of science.