My cousins _______ me and ask me what I was doing when I was studying in Canada.

Have you ____ joined in a dragon boat race?—Yes，I have．

We can have ___ bluer sky if we create ___ less polluted world.

________? I hope it was not serious.

Where does he want to go on vacation?—He wants to go to a place ______ it’s neither hot nor cold the whole year.[ ]