Many people can’t learn any lessons from the mistakes they’ve made __________ they get hurt somehow.
| A．whether | B．unless | C．if | D．as |
As he approached the door, Mike looked into the room again to see if he ________ anything behind.
| A．left | B．had left |
| C．has left | D．would leave |
—That must have been a terrifying experience.
—Yeah. I ________ in the damaged car, unable to move.
| A．was stuck | B．have been stuck |
| C．am stuck | D．had been stuck |
Although my sweater is a bit expensive, it ________ well.
| A．washes | B．has washed |
| C．is washed | D．can be washed |
The woman sitting next to me ________ very nervous, for she had never travelled by air.
| A．is | B．has been |
| C．was | D．had been |
—Are these seats available?
—Sorry, sir. The seats ________.
| A．have reserved | B．are reserved |
| C．reserved | D．are reserving |