第二十一课

找到一个合适的总统，要花费很大的努力

It takes a lot of effort to find an exactly right president.

present & president

正确原文：

It+takes+a lot+of+effort+to find exactly the righ*t* present.

it takes a lot of practices to make exactly the right pronunciation.

it takes a lot of patience to speak fluent English.

it took me great tolerance to accept the dog to sleep in my bed.

It takes (sb) 时间/金钱/努力/精力等 to do sth.

Sth. cost (sb.) 时间/金钱等.

Sb. spend 时间金钱等 on sth. 

Sb. spend 时间金钱等 doing sth.