(届陕西省五校联盟高三第二次模拟考试英语试卷)Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
—We need a person badly to be in charge of this design. —________ the new comer have a try?
I wonder why Jack always gets good marks when he does only ________ the others.
Not only ________ give people relaxation and pleasure, but ________ increase their knowledge of any kind.
When ________ questions in class, one should answer them as clearly as possible.
Stick to what you think is right, ________ you will gain a surprising happy ending.