1. 我们应该学会如何表达自己的想法。
   We should learn _____ _____ _____ ourselves.
2. 她空闲时常去图书馆。
    She often goes to the library _____ _____ _____.
3. 本对学习法语显出了浓厚的兴趣。
    Ben has _____ _____ _____ in learning French.
4. 我在考虑给我妈妈买件礼物，要么花要么一件衣服。
    I'm considering to buy my mother a present, _____ some flowers _____ a dress.
5. 我依然记得几年前我们第一次见面的情景。
    I still remember the time _____ _____ first _____ years ago.

A. buy
B. to buy
C. buying
D. will buy