She keeps a supply of candles in the house in case of power _________.
Frank put the medicine in the top drawer to make sure it would not be __________ to the kids.
----Is it my age __________ the boss minds? ----I’m afraid not. He will consider __________ necessary to have an experienced assistant.
Tony, would you go and see if Sam has any difficulty __________ his tape recorder?
Can you think of some cases __________drivers obviously knew the traffic rules but did not obey them.
The teacher highly recommended that I ___________ more to improve my English.