I have to fill in the blank with

(can,can't,could,couldn't,have to,must)

1.She ------ wait for me if She likes.
("can" maybe right choice).

2.John is verly slow.He --------- complete his home work in time.

("can" is right choice i think).

1. is correct. Think about 2. a little more. If someone is slow, are they really able to complete their work on time? That is, can they really complete anything on time? It seems to me that we are often not sure if people who are slow will complete their work on time or not!

What's the word to use when it's possible that John will not complete his work on time (because he is so slow)?
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I am very sorry,it was just typing mistake.

I think it should be "can't" or "couldn't"
 paco2004's reply was promoted to an answer.
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