I don’t doubt _______ he can finish the task, but I doubt _______ he is willing to do it.

I don’t think it is a performance.

(2013·郑州高中毕业班第一次质量预测)—Did you enjoy meeting your old schoolmates at the party last week?—Yes, I didWe ________ each other since we graduated from college

We have a Computer lesson _______ every Friday.

I need some blue ink today but there is ________ at hand.