In this section, we will briefly describe possible ways of reducing the costs and risks __________ in doing this.
His wife left him, because he was in such heavy debt _________ he could never __________.
Do remember to remind her_________the gas before she leaves.
Last summer holiday, I went back to my hometown, ________ the neighbours and the house ________ I used to be familiar with were gone.
Nuclear science should be developed to benefit the people ______ harm them.
—May I smoke here? —If you ________, choose a seat in the smoking section.