- If you have any problems during your study here,please do not _______ to call me for help
- As a teacher, you should not _______ the students from asking questions in class.
- When traveling alone in the mountains, you ’d better take a _______ with you in case you get lost.
- It is not ---_______ for me to return all the books to the library now because I still need some of them for my research.
- This morning in the class, our teacher lost his ______at last because he could not stand any more.
- Several loudspeakers are _______ from the ceiling and we can hear the speaker very clearly.
- Without a proper education, people could _______ all kinds of crimes.
- I have not heard anything from him since his _______.
- Both sugar and salt can ______in water.
- Students with _______ problems may apply for student loans.
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