The weather that day may not be as good as expected, in ________ case we will have to put off the event.
With the exam ______ in ten minutes, they were asked to hand in their mobile phones.
More than one doctor _____ involved in the rescue that took place after the earthquake.
Some hard-working students always keep a torch in their domitories _____ there is a power failure.
_____ in charge of two classes made Mrs. Li, head of Senior Grade 3, extremely tired.
Almost every teenager will experience a period in their life _____ they aren’t content with their parents .