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).
