----Recent years have _______ rapid changes of my hometown. ----Yes, I could hardly recognize it when I arrived yesterday.
Is there a certain cure ___ lung cancer yet?
-- Can I call you back at two o'clock this afternoon?-- I'm sorry, but by then I ____ to Beijing. How about five?
The little boy was allowed to go to have a swim _____ he finished his homework.
-- Can you keep an eye on my bag? I need to go to the washing closet.-- ________ . It'll be safe with me.
——If you make it in the competition, I’ll buy you a drink.——Ok. ______!