Had I known about this computer program, a huge amount of time and energy________.

—______ you pass the examination on the first attempt?—Of course. You know, I have been preparing for it for a long time.

.We were all waiting for you .You _____for the seaside by yourself without leaving a message.

You＿＿＿＿＿＿＿go to the party if you don’t finish your homework first. 

----Where have you been?---- I _______ stuck in the traffic. I ________ here earlier.