Make Meaningful sentence using of given this phrase " to take care"

In the following question, two columns are given, containing a connector and three phrases each. In the first column, the phrases are A, B and C and in the second column, the phrases are D, E and F. You have to make meaningful sentences using the connectors and from the phrases of both the columns. There are five options, four of which display the sequence(s) in which the phrases with the connectors can be joined to form a grammatically and contextually correct sentence. Not only…but also I. (A) The street door of the roominghouse was unlocked. (B) The thieves stole the jewels. (C) The staff at the consulate seemed insensitive. II. (D) The staff was professionally inadequate. (E) They smashed up most of the valuable furniture in the room. (F) The street door of the roominghouse was wide open.

Select the most appropriate word to fill in the blank and make a meaningful sentence. Be careful not to drop this glass case, it's very ________.