解决一下这几道题目

i am sure i have l___ my new pen because i can't find it anywhere.

the boy often sleeps with the window open u___ it's really cold.

the old man over there is r___ as the best doctor in our town.

we'd like to develop f___  with other countries.

tv has greatly i___ children's lives.

lose ，unless， regard ，friendships，不会意思懂但没找到这个单词＾_＾||