----- Mary looks very upset. She _______ failed to pass the exam. ----- I guess so. It's very difficult after all. A must have B could have C should have D might have
According to the recent research, heavy coffee drinking and heart attack is not necessarily __________ and effect.
The following day she didn’t go to the club. __________, she walked her dog in a park nearby.
In the botanical garden we can find a(n) __________ of plants that range from tall trees to small flowers.
Many animals and plants, which couldn’t __________ the sudden change of the climate, died out. Dinosaurs are one such example.
Letterboxes are much more __________ in the UK than in the US, where most people have a mailbox instead.