I think _ ____necessary __ _____ to take more exercise.
We shall not lose heart in the face of difficulties. Which of the following is correct for the underlined word in the sentence?
A: David, remember to turn off the lights before leaving the house. B: ________
A: I’m really sorry to have broken your beautiful vase. B: ________
________ exciting our life will be in the future with so many wonderful inventions!
A: ________ will we have our summer holiday? I am looking forward to a nice trip. B: In two months, I suppose.