--- What can I do for you, Sabrina? --- I find it hard to ____ the matter to you, sir, but I really want a raise.
_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in human bodies.
The discovery of new evidence led to _________.
You have made a ______. You have _____ two lines from this paragraph
He _____ to the meeting ten minutes earlier, but he was _______ by a heavy fog.
– I wonder if you could go with me to the cinema.--- Don’t disturb me. I ______ a composition all the morning and haven’t finished it yet.