Grammar, Usage / HELP ME WITH MULTIPLE CHOICE CLOZE [3]

HI
I would like somene can check my answer .
thanks

proper word choice

She (1)GLANZED At the cellphone to see the time. It was almost 5 pm, the time had flown really quickly. She (2)COULD HAVE more than 3 hours studying, without noticing it. (3)DESPITE feeling slightly tires, she thought she might still stay for a little be more to finish her exam preparation. Suddenly she remembered than Jenny, her best friend, was supposed to(4) COME OVER that evening. She wished she could go out with her and maybe even got o their common friend's birthday party. A quick thought flashed through her mind: " if I(5) HAD STARTED..... getting ready for the exam at least a week earlier I'd be able to go to that party tonigh" and she drew a deep sigh.

1.Glanced- glared- stared- gazed
2.Can have- could have- must have- should have
3.In spite - although - despite- however
4.Come on - come out- come down - come over
5.Started - had started - has started - starts