23.This is the second time Nie Haisheng ______ to be the astronaut who took the glorious task.
—I’m going to Venice next week. —________. Carnival will be held then. Have fun!
It’s an either-or situation——we can buy a new car this year or we can go on holiday, but we can’t do _______.
—I feel so nervous about the National English Speech Competition tomorrow. —_______.
It was not until _______ that _______ to prepare his lessons.
In the summer months the difference in temperature between the south and the north can be ________ twenty degrees!