By taking the scientific development of his day one step further, Jules Verne _______ modern science fiction. A. lay the foundation of B. laid the foundation of C. lie the foundation of C. lain the foundation of
Had it not been for the fact that about 30 pupils __________ in the state of Connecticut a fortnight ago, their parents ___________ in deep sorrow now.
Experts have found that the disease will lead to a greater increase in the number of sufferers unless ________ seriously when the symptom first appears.