1 . 选词填空

be fluent in, in advance, be suitable for, be concerned about, concentrate on

1. The advantage of booking tickets ________________ is that you can get better seats.
2. Soon she found that if she ________________the ideas, not the single words, she could understand.
3. The course seems difficult and   ________________(not) freshman students.
4. You don't have to ________________getting low grades at the end of the term if you try your best now.
5. As she has been in England for many years, she ________________ English.