.We cannot figure out ____quite a number of insects, birds, and animals are dying out.
In recent years travel agencies have succeeded in selling us the idea that ________, the better our holidays will be.
______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
The traveler _______ his coat on a stone and _______ down to have a rest.
The ______ look on the manager’s face suggested that he _______ to overcome the difficulty.
I told her we weren’t going to be friends any more because she couldn’t ________ .