In China, ____ car is getting to be _____ popular means of transportation.
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 .
Little did the teacher imagine that a student good at maths _____ have failed in the exam.
— I’ve never seen you so rude!— I _____ something I shouldn’t have, but I didn’t mean that.