Underline the correct phrase to complete the sentences a. Mike can't have stolen/ might steal/ must have stolen/ could steal the necklace as his…

Underline the correct phrase to complete the sentences a. Mike can't have stolen/ might steal/ must have stolen/ could steal the necklace as his fingerprints were found all over it. b. hilary's late! her car might break down/could have broken down/ can't have broken down /could break down although that seems rather unlikely as it's a new one