His sister left home in 1998, and _______ever since.
| A．has not heard from | B．had not heard from |
| C．has not been heard of | D．had not been heard of |
To understand the grammar of the sentence，you must break it ________ into parts.
| A．up | B．down | C．off | D．out |
When ________ imported goods，people are ________ about all the different labels on food
these days.
| A．choosing；confused | B．choosing；confusing |
| C．chosen；frightening | D．choosing；frightened |
The program will double the amount of money ________ to help pay for child care.
| A．valuable | B．convenient | C．comfortable | D．available |
A quarrel _________, which made him ______ his family.
| A．was broken out; break away |
| B．broke out; break away from |
| C．was broken away; break down |
| D．broke down; break out |
________ and short of breath，Andy and Ruby were the first to reach the top of Mount Tai.
| A．To be tired | B．Tired | C．Tiring | D．Being tired |