Some students are so that they often make mistakes in their homework.
A. careful B. carefully C. careless
People are puzzled ________ they read the book.
| A．the first time | B．at the first time | C．for the first time | D．at first |
The soldier was of running away when the enemy attacked.
| A．scolded | B．charged | C．accused | D．punished |
According to the air traffic rules, you should ________ off your mobile phone before
boarding.
| A．cut | B．put | C．call | D．switch |
Despite the language ________, they soon became good friends.
| A．conflict | B．barrier | C．misunderstanding | D．dilemma |
You’ve ________ the most important word in this sentence.
| A．left off | B．left out | C．left behind | D．left over |