Nobody knows ______ yesterday.

What food did you ________ just now? –Beef noodles, but it hasn’t arrived yet.

We can’t put off ______a plan. Clean–Up Day is coming.

Will you take D5581 or G7619 to Hangzhou? — G7619. I will have to more money, but it will much less time.

Chairman (主席) Xi asks us strict economy (厉行节约) in our daily life.