Swimmers must be very strong in order to build up speed because of the high resistance of the water. Runners, ____, must struggle against the heavy resistance of the air and ground.
_____, he talks a lot about his favorite singers after class.
Never before _______in greater need of modern public transport than it is today.
______ about wild plants that they decided to make a trip to Madagascar for further research
______, Carolina couldn't get the door open.
____ snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest.