__________ he had not hurt his leg, John would have won the race.
28. I'm afraid we'll have to work extra hours for there are still some problems ________.
27. Since I don’t like many vegetables, can I eat fruits every day instead____ the nutrients I need?
26. How long do you think ________ the computer company brings out a new product?
25.He left for lunch________ the clock_________ twelve.
24. The boy the teachers considered _____ was caught ______ in the exam, which surprised us very much.