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 always brings me a pretty gift _______ he comes to visit me.
His pale face suggested that he _____ ill and his teacher suggested that he ______to the hospital at once.
Tom was about to close the window ______ his attention was caught by a bird.
It is in the hotel _____ he stayed last night ______ he lot his mobile phone.
Lydia doesn’t feel like ________ abroad. Her parents are old.