—John has put forward _______ most challenging question for us to answer.
—Yes, it really is. I have never heard _______ harder one.
| A．the; 不填 | B．不填; the | C．the; the | D．a; a |
An ecosystem consists of the living and nonliving things in an area __________ interact(互相作用) with one another.
| A．that | B．where | C．who | D．what |
Welcome to our hometown--- Liuyang. There are many places worth _________, such as Dawei Mountain, Tansitong’s Birthplace and Confucius Temple .
| A．to visit | B．visiting |
| C．visited | D．to be visited |
The outbreak of the Ebola virus primarily affects 3 countries in West Africa. However, it has become a little ______ and over 15,900 cases and 5,689 deaths have been reported globally by the WHO recently.
| A．out of place | B．out of control |
| C．out of reach | D．out of sight |
Many African people have only the basics of survival. It’s ______ unbelievable.
| A．absolutely | B．hardly |
| C．unfortunately | D．obviously |
The caring mother closed the door in a ______ way so as not to wake the baby, who had just fallen asleep after an hour’s crying.
| A．curious | B．serious |
| C．cautious | D．various |