In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.

It’s time for sports! your sports shoes, please. —— Ok, I’m coming.

Did you see the film star—________，I couldn’t make it I was delayed by the traffic

Though its economy is speeding fast, China’s average family income is far below ________ of the developed countries.

Alex, the bus is coming, but I have to go back to change my coat.—_______, or we’ll miss it.