Would you mind taking photos with me?—Of course not．When I ______ you，I can have a look at them．

What was it ________ he was so eager to get?

Who do you _____is the funniest actor?

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.

The reason ______ the delay is ______ we have had difficulty in obtaining materials.