一Mary, is this _______ruler一No, _________ is in the pencil case.

We should do what we can ________ the endangered animals.—Yes, it’s our duty_________ them.

I’ve bought all the food for the party tonight.-Thank you. Then I ____ go to the supermarket.

We failed in the singing competition. —_______. Better times are waiting for you.

The danger of HINI was real, especially in the beginning, little was known about the new disease