He found_ ________very difficult ________the math problem.
_______hard work it is! And__________should I do to complete it well?
‘I’____the first letter in the word‘irregular’,and there is___‘u’and ___‘l’in it.
﹣I think collecting stamps is great fun. ﹣__________ We can also learn a lot from it. A. I agree with you. B. No, I don’t think so. C. No, I don’t like it.
﹣Peter, could you tell me ___________? ﹣He is under the tree over there. A. where your father is B. what your father is C. how your father is
﹣Why are the windows so dirty? ﹣Because we __________ them for a long time. A. have cleaned B. haven’t cleaned C. didn’t clean