“___________ race” means that two people form a group with their on-leg tied and they will walk for contest with three legs.

I tried many times, but I still failed in the experiment. –Don’t be discouraged. _______ and the problem will be settled.

Over the past decades , sea ice in the Arctic as a result of global warming .

Don’t ________ in the street. It’s very dangerous.

Nothing that he suggested _____ to be ofany use