She looks sad. Could you please tell me that prevents her from being as happy as before?[ ]

_________the exams to worry about, I have to work really hard this weekend.

Many accidents_____ by careless drivers lastyear.

His wife was ill in hospital, but____it didn’t havemuch influence on his research work[ ]

Can you tell me why you learn English so well–It’s very simple. you work, grades you will get.