So necessary _____ it to learn about their customs that I will attend a special lecture next week.

It made him quite_______ when I thought of my sick uncle．

The song reminds me of my old school days as soon as it _____ .

With Mr. Smith ______ at going home, I’ve ____ a car to pick him up tomorrow. [ ]

We’ve spent too much money recently.—Well，it isn’t surprisingOur friends and relatives ______ around all the time