Our school sports meeting we had looked forward to______ in _______ fine weather, which was beyond our expectation.

Air quality in our city is becoming worse and worse.—Yes. These days’ PM2.5 readings are frightening. We must do something to ______air pollution.

.How do we say the number “4,135 ”?

One of the most interesting places in Hangzhou ________ are often visited by foreigners is the West Lake.

The letter from parents makes David __________ blue.