Having checked the doors were closed, and ______ all the lights were off, the boy openedthe door to his bedroom[ ]

t your help, I _____the exam last term

ng, now a student of Shanghai JiaotongUniversity majoring in financial management, _______basketball in NBA for nineyears

You don’t see the professor from Singapore quite often, do you? —No, we only meet ______

The restlessness of animals _____ a possible occurrence of an earthquake. [ ]