_________worries me the way he keeps changing his mind.
-- 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. ______!
Many college students are willing to work in Western China after graduation _______, poor and backward as it is, more opportunities of employment are available.