--What on earth are the police busy with? ---They have been looking into how the plane crash _______.
He can speak English,German,French and Japanese.He is nearly a man with a(an)________for languages.
—It’s a long way to go!We must take a taxi. —________for a taxi.The underground can save money.
Jack sent for a doctor after we met with the accident.________I stayed there with the injured old woman.
Our government________the measures put forward by some experts at the meeting and decided to carry them out at once to prevent further air pollution in this area.
Only when he put his foot into the river________that the water was too cold to swim in.