翻译。

1. 多年来,这位老人日夜梦想着回到自己的祖国.

For many years, the old man has been dreaming ______ and ______ about going back to his homeland.

2. 他在屏住呼吸.

He is trying to ______ his ______.

3. 这个大会是为了纪念他们祖先的到来.

The meeting is in ______ ______ their ancestors' arrival.

4. 商店老板试图通过打折来赢回顾客.

The shopkeeper is trying to _____ his customers ______ with a discount.

5. 不要担心,我不久还会来看你的.

Don't worry. I shall visit you again ______ ______.

信用证开立种类很多，在长年定期、定量供货的情况下，一般最适用采用（）.

A、背对背信用证

B、循环信用证

C、可转让信用证

D、对开信用证