China’s high-speed railways _________ from 9,000 to 25,000 kilometers in the past few years.
A. are growing B. have grown C. will grow D. had grown
During the Mid-Autumn Festival, family members often gather together _________ a meal, admire the moon and enjoy moon cakes.
A. share B. to share C. having shared D. shared
She and her family bicycle to work, _________ helps them keep fit.
A. which B. who C. as D. that
Susan had quit her well-paid job and _________ as a volunteer in the neighborhood when I visited her last year.
A. is working B. was working C. has worked D. had worked
_________ along the old Silk Road is an interesting and rewarding experience
A. Travel B. Traveling C. Having traveled D. Traveled
_________ we don’t stop climate change, many animals and plants in the world will be gone.
A. Although B. While C. If D. Until
