Is this the problem ____the teacher explained last week ? Choose the wrong answer :
The tower_____ in the 1800s is the oldest building in this area.
The computer system ____suddenly while he was searching for information on the Internet.
Linda was in____ dilemma when she was required either to complete the dangerous travel before____ deadline or to stay where she was forever.
Every evening after dinner, if not ______from work, I will spend some time _____ my dog.
Never before _____in greater need of modern public transport than it is today.