4 . 根据句意，选择单词或短语并以其适当形式填空。

whichever, whenever, wherever, however, no matter who, no matter whose, no matter how many, no matter what

1. Bob and his sister are very close. ________ he goes abroad, he buys presents for his sister.
2. Please read the rules carefully. ________ you are, you have to obey the rules and there is no exception.
3. Emily is a famous volleyball player. ________ she goes, there are crowds of people waiting to see her.
4. The information of the lost items will be found on the screen over there. ________ suitcase it is, it will be kept until the owner returns.
5. ________ times I tell him I am busy, he just doesn’t believe me.
6. ________ psychological problems you have, you can turn to Professor Li for help, who is the best psychologist I have ever met.
7. ________ way she chooses, we should respect and accept her decision and try our best to assist her.
8. ________ carefully I explained, she still didn’t understand how the detective in the film found out the killer.