4 . 根据句意，选择单词或短语并以其适当形式填空。

as a result,        concern,               annoy,               gather,               previous,        proposal, get discount on,     reject,               sufficient,        delete,               check out,        position,        threat

1. You might not believe this, but even some famous author's books were ________ many times before being accepted and published.
2. Have you heard of the new 24-hour bookshop? I'm going to ________ it ________tonight.
3. The musician hopes that he will have ________ time to make the new album.
4. Many people do not realise the importance of space exploration technology in their lives, ________ space exploration becomes a waste of time and money in their eyes.
5. The girl was ________ with her boyfriend, who was late for her birthday party.
6. The new assistant impressed the boss with his creative ________ for solving the company's problems.
7. We are ________about endangered animals.
8. It is believed that many plant species are ________ with extinction now.
9. An increasing number of people like shopping online because they can often ________ many goods.
10. That app which isn't needed anymore ________ from my smartphone already.
11. While taking pictures, ensure that the camera is ________ at the eye level of the subject.
12. Many styles of music start as a reaction to a ________ one by changing it somehow in one way or another.
13. Thanksgiving and the Mid-Autumn Festival are the harvest festivals when people ______ and celebrate what they are grateful for.