【单选题】Si nous sommes en difficulté, il nous_________.
【单选题】It is difficult for a teacher to give attention to children in a large class.We should reform the situation in order to meet each child’s needs.
【单选题】The word 'fix' in 'you are caught in a fix' in paragraph 1 refers to ______.
B.
your preference of one choice
D.
two things are to be done at the same time
【简答题】During the 19th century, natural gas was used on a local scale because of the difficult situation in___________.