The work is supposed ________ before Wednesday.
I know this plan is far from perfect, but I just can’t think of _______one.
Mr.Smith, together with his two sons,_____Shanghai for about five months.
— 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.
---Do you like tea or coffee? --- coffee. I prefer coffee ______ milk.
What _____ good time we had________ a picnic yesterday!