Do you know the man ________ visited the United States in February? –Yes. He is Chinese Vice-President Xi Jinping. He said it was his _______ visit to the United States.

Are you in a hurry?—No, I’ve got plenty of time. I _______ wait.

Mike wants to know if ________ a picnic tomorrow.—- Yes. But if it ________, we will visit the museum instead.

The homework is too difficult. I can’t do it _____your help.[ ]

To make China _________ the USA in science and technology, we need more talents.