They eat only plant foods, and take care to ________ animal products from other areas of their lives.
| A．contain | B．maintain |
| C．exclude | D．Include |
“Is ______ you want to say？” asked the teacher.
| A．this | B．that |
| C．all that | D．that all |
He pointed to ______ looked like a tomb and said, “Ghost.”
| A．that | B．what |
| C．which | D．as |
After _______ had happened he could not continue to work there.
| A．which | B．how |
| C．what | D．having |
She was so angry and spoke so fast that none of us understood _______ he said meant.
| A．that | B．what |
| C．that that | D．what what |
______ medicine works in a human body is a question _______ not everyone can understand fully.
| A．How; that | B．That; which |
| C．That; which | D．What; that |