—The weather isn't good enough for an outing，is it?—Not at all. We can't have ________ at this time of the year.

—Haven’t seen Lucy recently. What’s happened?—Oh, it’s more than two months ______ she worked here.

There is no doubt ________ those who work hard will succeed sooner or later.

I don’t remember how many years ago ______________I paid my last visit to the principle of my primary school.

Modern science and technology has ___ communication between people far apart.