Beijing _______a lot in the past ten years. Now it has become one of the biggest modern________ in the world.

My sister ______ go to bed _______ my mother came back last night.

Another two months will be needed before the bridge_______.

hinese saying goes, a mountain ______ be too high or an ocean too deep. Therefore, there is no end to our self-improvement.

The trip must have been terrible，wasn’t it?—No.________，I enjoyed every minute