1 . He had to ________ that it was not easy to gain ________ to the Buckingham Palace. (admit) (所给词的适当形式填空)

2 . Her body was no longer able to ________ (defence) itself against disease. (所给词的适当形式填空)

3 . After he greeted his friend, they ________ (begin) to talk. (所给词的适当形式填空)

5 . –Look at these black clouds.—It___________(rain)

6 . The plane ________(leave) for London.

7 . A new company ________(found) in our town next month. （所给词的适当形式填空）

8 . If I __________(delay) by something and I hadn't collected him from the yard just after 9am, he would work out the route to my workplace all by himself. (所给词的适当形式填空)

9 . You should tell your parents that you're fine, otherwise, they will be concerned ________ you. （用适当的单词填空）