【1】 Marty ______ (work) really hard on his book and he thinks he'll have finished it by Friday.

A. is working    B. has been working

解析：选B答案：用现在完成进行时态，表示动作从过去某一时间一直持续到现在的情况。

备注：现在进行时态，只描述说话人所关心现在此时此刻正在做某事，无法表达/描述从过去某个时间一直持续到说话人所关心现在时间的情况。

【2】We have decided that the headmaster _____ (award) the prize to those gifted students at the meeting tomorrow.

A. will award    B. would award

解析：选A答案。用一般将来时态，主语用现在完成时态，从句用一般将来时态与后面将来时间状语tomorrow(明天)遥相呼应，描述将来发生的情况和事情。

备注：当主句用“一般现在时态/现在完成时态”，宾语从句可以根据实际情况选用任何时态，宾语从句用有将来时间状语(tomorrow明天)，用一般将来时态。