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）.
6. He is a _____（有天赋的） musician and promises to be a famous musician.
