_____to nuclear radiation, even for a short time , may produce variants(变异体) of genes in human bodies.

Can you please speak __________, Lucy We can’t hear you.

I went to see a film yesterday.— Oh, did you? _____. [ ]

It was in the garden of the old house _____ he bought last year ______he dug up a pot of gold.

leader of the team, always think of_______ he can do more for his teammates