31．In summer, food will go bad if_________in room temperature.
| A．leaving | B．left | C．being left | D．having left |
Did you notice the ______ on the leader’s face when he heard 23 countries couldn’t get enough rice in Africa?
| A．appearance | B．description | C．expression | D．attitude |
All of you can choose to take part in our after-class activities, which all take place under the _______ of experienced teachers.
| A．guidance | B．help | C．power | D．reception |
—Have you seen recently? —No, but I _______ dinner with him on Friday.
| A．had | B．have had | C．am having | D．was having |
Fish have eyes and ______ appears to be a nose, and they can hear, too.
| A．that | B．what | C．it | D．which |
____ sweet and fresh, this kind of food is so popular with local people and tourists.
| A．Smell | B．Smelling | C．To smell | D．Smelt |