It is believed that red can bring good luck people in China．

he successful launch of Tiangong-l, which was_____ breakthrough in space field,China’s space dream took a step closer to_____ reality.

The woman said he _____ use yellow to remind him _______ a warm sunny day.

Would you mind me how this physics problem

Dennis works long hours each day, and he _____tobecome a doctor in 10 years .