I think that the best ___ to visit Hannan Island is in November because the weather is excellent then.
— The problem is a bit difficult .— ________ask your teacher for help?
—Did you know that the earth is the home of animals?
—Which country has________population ,China , India or America?— China.
I bought a new sweater last weekend. It________me 120 yuan.
—You must look around when you go________the street.