_____ about the safety of her son, John’s mother looked upset．
| A．Concerning | B．Concerned | C．To concern | D．Concern |
We have worked out the plan and now we must put it into＿＿＿．
| A．fact | B．reality | C．practice | D．deed |
Three-fourths of the surface of the earth＿＿＿sea．
| A．is | B．are | C．were | D．has been |
If these trousers are too big, buy a smaller＿＿＿．
| A．set | B．one | C．copy | D．pair |
—— Did you find your pen this afternoon?
—— No, I didn’t find＿＿＿＿＿, but I’ve bought＿＿＿＿＿．
| A．it； it | B．one； one | C．it； one | D．one； it |
His “Selected Stories”＿＿＿＿＿first published in 1990．
| A．were | B．was | C．has been | D．have been |