The physics teacher once said that we first _____the lightning followed by thunders because light ______ faster than sound.
I __________ a few words of Greek when I was there last year.
I __________ to be out when you called me this morning.
-I was amazed to find that you are an excellent cook. -I have experience __________ cooking at an Italian restaurant.
Strong __________ can be very dangerous for swimmers.
Mr Brown is a(n)__________ secretary in our office, for he is able to do tasks successfully, without wasting time and energy.