—Mike, are you familiar ________ this new type of car? Just give me some advice.—Oh, I'm sorry. It is really a new one.
________ at the result, the boss left without saying any word.
It was quite a job for her to ____ several children all by herself during the war.
He looked around and caught a man _______ his hand into the pocket of a passenger.
It’s always difficult being in a foreign country, ________ if you don’t speak the language.
Only when he met the girl his aunt introduced to him ____ that he had seen her before.