I _________ an old photo while __________ my album, which reminded me of my happy childhood.

(2013·安徽，27)This project requires close teamwork.________ will be achieved unless we work well together.

I would greatly _____ it if you could send me the letter as soon as possible.

Some students think it is ___ to spend some time surfing the Internet, but we shouldn’t be too dependent on it.

Kelly gave me a vivid ________ of her trip to Mount Tai after her return.