--- Now lots of teenagers spend a lot of time playing computer games.
--- Yes. Teachers and their parents should prevent them ___________ too much.
| A．to play | B．play |
| C．plays | D．playing |
The number of the red-crowned cranes will become ____ if we don’t take any action.
| A．fewer and fewer | B．less and less | C．smaller and smaller | D．larger and larger |
---You were out when I went to your house this morning.
---Oh, I _______ for a friend from England at the airport.
| A．was waiting | B．waited | C．am waiting | D．have waited |
He is getting ______ to hear the ____ words.
| A．boring; boring | B．bored; boring | C．boring; bored | D．bored; bored |
If you _____ at noon, you ____ the feeding of animals.
| A．arrive at there; will see | B．will arrive there; will see |
| C．arrive there; will see | D．arrive in there; see |
Amy makes fewer mistakes than Frank. She does her homework ________.
| A．more carefully | B．more carelessly | C．more careful | D．more careless |