一Cathy can’t come for dinner.She’s leaving for London tonight. 一 .I hope I can talk to her soon.
I was really too busy with my homework and I couldn't help ____________ housework.
Mary is one of the brightest students who_________ from New York University.
Mary is short__________ her brother is very tall.
--Whose advice do you think I should take?--___________.
__________ you understand the rule, you will have no further difficulty.