根据句意和汉语提示，填写恰当的短语完成下列句子。

1. She is the __________(主唱) in the concert.

2. We humans are hoping to live on the moon __________(有朝一日).

3. He __________(离开) yesterday. He has gone to Shanghai.

4. We have lived in the countryside ___________(在过去的几年里).

5. We went to the airport to ___________(与……告别) Mr Green.

6. ___________(一半的) the students have been to the museum.

按信用证支付方式和FOB条件达成进口合同后，进口方首先要做的工作是（）。

A.租船订舱

B.办理保险

C.报关

D.开立信用证