1. Building such a skyscraper is not an easy job; we must have enough _______(专业的)engineers.
2. He ______(获得)a knowledge of computers by careful study.
3. She doesn’t want to take her new boyfriend home in case her parents don’t _____(同意).
4. It was an unusually hot summer and air conditioners were in great _______(需求).
5. Visitors to the museum are not allowed to take __________(照片).