If it is convenient ____you , I want to ask you to help me repair the roof of the kitchen. on Friday .A. to B. for C. with D at
_____ 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.
Tom was sorry to learn that his grandfather _____ for half an hour when he got to the hospital.