Complete the text with one word from the list in each space
Words: allow, forced, refused, careful, learned, sorry, decided, let, supposed, encouraged, managed, threatened, failed, prepared, trying

I’m (...) to say that we have (...) to close the science laboratory until further notice.Although we have always (...) pupils to conduct safe experiments, and have always believed it was important to (...) students discover science for themselves, recent events have made it difficult for us to (...) such work to continue. I am referring of course to the robot that Class 5 (...) to construct recently while they were(...) to be constructing a simple computer. Although at first the builders of this machine were (...) to hide their machine from members of staff, unfortunately they (...) to control the robot. It not only(...) how to leave the laboratory, but walked into the town centre and broke into the National Bank in Green Street. It is impossible to imagine what it was (...) to do. The pupils who built it have (..) to say whether they were controlling its actions. In any case, the police were not (..) to permit this situation to continue, especially when the robot (...) to attack members of the bank staff, and (...) them to fill a large bag with money.