—How long do you think it will be ________ we win the football World Cup?   
—Perhaps twenty years.

He was driving a lorry load of bananas ____he came off the road at a bend and fell into the valley.

_______ on earth is it _______ has eaten up all the leaves of these young trees in just
one night?

One more day, _______ I will get everything ready.

Monica promised to forgive Jason _______ he showed his actual deeds.

—Can you describe _____ it happened?
　　　　—Yes, I was riding on my bike _____ a car knocked me down from behind.

It really seemed ages _____ the police came on the scene and cleared away the damaged
　　　　cars.

_____ she had not spelt the word wrong, Cathy would have got a full mark.

He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.

Though he had been trained for three months,       he didn’t pass the exam.