.I was about to leave the house ____the telephone rang.
We all know that, _______, the situation will get worse.
The fearless pirates kept _______ on the waters off the coat of Somalia, from the Gulf of Aden to the Kenya border along the Indian Ocean.
_______ the pull of the earth, a rocket must reach a speed of 28440 km/h.
The city, _______ by an army of 1,500 soldiers, was difficult to take.
It was not until he told me ______ what had happened.