I was about to leave my house______ the telephone rang.

It was only with the help of the local guide _______.

Was it in the factory _____ you worked five years ago ____ you met your wife for the first time?

It was only with the help of the local guide __________.

There are some health problems that, when _____ in time, can become bigger ones later on.

The lady said she would buy a gift for her daughter with the ________.

Will future scientific discoveries ______ for us to live a much longer life?

Though it’s not the 1st time that I ________ Beijing, I still can’t adjust myself to the weather.

I’m living in the apartment nearby.Come and see me whenever________.

Only when he told me________what trouble he was in.