The teachers often tell their pupils _____ across the road when the traffic light is red.

Green economy offers a new model ________ people could both protect the climate and develop the economy, according to what Li said at the International Cooperative Conference on Green Economy and Climate Change.

________spending our vacation in a noisy crowded city,why not try hiking in the country?

Tomorrow is Dragon Boat Day, so my mother and my grandma __a big meal for our family in the kitchen.

Generally speaking, my grandmother is nice and kind, but she _______ be very stubborn at times.