It was not until she got home ___ Jennifer realized she had lost her keys.

I arrived at the Tianjin Train Station at 10:30 that day, by which time the express train for Beijing _____.

The police are looking into the cause which ________ the sinking of the ship with about 200 passengers aboard.

They usually go to see their grandparents ______ Sundays.

The speed of cars and trucks is ________ 30 kilometers per hour in large cities in China.