Scientists observe ___ making the most of our senses when we are young can keep us healthy later on in life.
| A．if | B．what | C．that | D．When |
The woman sold the eggs ________ seven dollars and they were sold ________ half price.
| A．with, at | B．for, at |
| C．at, in | D．by, on |
I’ve kept up a friendship with a girl whom I was at school ________ twenty years ago.
| A．till | B．with |
| C．about | D．since |
In the experiment we kept a watchful eye ________ the developments and recorded every detail.
| A．in | B．at |
| C．for | D．on |
I don’t think it’s fair to judge a person ________ their clothes.
| A．in | B．from |
| C．with | D．on |
I am anxious about what notes he made in the back of his diary ________ things to mend or replace.
| A．by | B．in |
| C．with | D．of |