– I tried many times, but I still failed in the experiment.– Don’t be discouraged. ______ and the problem will be settled.
I know little about the accident because not much_________ about it up to now
I’ve been away for only three years, _____ I can hardly recognize my hometown
In China, you _____ vote when you are 18.
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
Many workers were organized to clear away remained of the World Trade Center.