Since we _____________the opening policy, we started our journey to happiness.

He ______ when the bus came to a sudden stop．

The trip to that city was eye-opening for everyone, and near its end, all the young people in our group began to reflect on what it had meant. We __21___the first night we had arrived. We had all gone into the markets of the city ___22__the young people could experience its energy. But what we actually saw simply __23__ us all ---- the rundown houses, the children in rags, the people begging for money … Walking home, ___24____ under a low bridge, we came across ___25___ families of homeless people seeking a bit of dry ground to sleep on __26__ the night. We had to step over bodies as we found our way through the darkness.

Only when we hurried to the airport__________the flight was cancelled.

We ______our dinner when a policeman came to the door.

We had decided to sell our house, but after a while we began to have second ________.

When implementing the project, we__________a lot of unexpected opposition from our colleagues．

When Bob and his friends came, we _____ our supper then.

When Bob and his friends came, we ______ our supper then.

I told the policeman ______ had happened when I was taken to the police station as a witness.

When Lily came home at 5 p.m. yesterday， her mother _______ dinner in the kitchen.

When our imports ______ our exports, we say we have a favorable trade balance; however, when our imports and exports are the other way round we say we have an unfavorable trade balance.