13． --Hi, Lydia． Are you going to the concert on Friday?
- -I’d like to. But there are so many problems ____.
| A．remaining to be settled | B．remained settling |
| C．remaining to settle | D．remained to be settled |
Carl is studying ________ food science at college and hopes to open up ________ meat processing factory of his own one day.
| A．/；a | B．/；the | C．the；a | D．the；the |
Sarah looked at ________ finished painting with ________ satisfaction.
| A．/；a | B．a；the | C．the；/ | D．the；a |
The parents were shocked by ________ news that their son needed ________ operation on his knee.
| A．a；/ | B．the; / | C．the; an | D．a; an |
People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.
| A．a；an | B．a；/ | C．/；the | D．the；an |
Marco Polo is said to have sailed on ________ Pacific Ocean on his way to Java in ________ thirteenth century.
| A．the；a | B．a；/ | C．/； the | D．the；the |