People love the convenience of bottled water, but if they ________ the problem it causes, they ________ try carrying water in a reusable steel container instead of plastic.
| A．realized; will | B．had realized; will |
| C．realized; would | D．have realized; would |
____ you told me, I had heard nothing of what happened.
| A．Till | B．Until | C．After | D．Since |
He ran off____ I could stop him.
| A．before | B．after | C．since | D．when |
We should pay attention ____ to industry ____ to agriculture.
| A．either, or | B．neither, nor | C．not, but | D．both, and |
My sister is expecting me,____ I must be off now.
| A．however | B．or | C．so | D．otherwise |
Do not make the same mistake ____ I did.
| A．so | B．as | C．like | D．that |