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）.
