1.In the last 20 years,this country has been t       into an advanced industrial power. 
答案:transformed
2.Mr Smith was chosen to        (代表)the company at the conference. 
答案:represent
3.The climbers had to u       a lot of sufferings before reaching the top. 
答案:undergo
4.His wife       (确保) that he took all his pills every day. 
答案:ensured
5.We can’t       (付得起钱)to go on vacation this year. 
答案:afford