oblem with seeing famous tourist attractions is the steady＿of people all trying to see the place at the same time, so I doubt whether it is worth it.

14How can you cross the river _________ by swimming

After a whole afternoon’s heated discussion, they finally to us what had been decided.

What do you usually use your computer __________ — I usually use it to do word processing.

Taobao.com is a free site, _________ visitors can not just purchase almost all kinds of products but open their own online shops.