The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
Next door to ours _______, who seem to have settled in this community for quite a long time.
--- I’ve nothing on me except this ten-yuan note to donate, I’m afraid.--- Never mind. ______. We really appreciate your assistance.
September 30 is the day ______ which you must pay your bill.
. ----I’d like some more beer.----Sorry, there’s ______ left.
I cannot get my son to understand that extra time _______ now will pay off in the future.