I was really anxious about you. You _______ home without a word．
| A．mustn’t leave | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t leave |
If the boy had _____ the dog alone it wouldn't have bitten him.
| A．set | B．left | C．had | D．put |
The generation _____ makes it difficult for parents to understand their children's opinions.
| A．division | B．gap | C．separation | D．interval |
Despite their good service, most inns are less costly than hotels of _____ standards.
| A．equivalent | B．uniform | C．alike | D．likely |
He was afraid that the branch might bend over and break, and he would be sent _____ to the ground.
| A．crashing | B．throwing | C．rushing | D．dropping |
They always kept on good _____ with their next-door neighbors for the children's sake.
| A．friendship | B．relations | C．intentions | D．terms |