. -- Do you think Allan came by taxi?
-- No. If he had, I don't believe he ______ his bike here.
| A．would leave | B．left | C．would have left | D．had left |
____ 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 |