More wild tigers have been seen in the forest around this area, ____ there used to be very few[ ]

I believe the scientists will______a betterway to heal the disease.

John promised his doctor he ________not smoke，and he has never smoked ever since

hear Mr. Smith was writing a story last year and he still ____.

reme weather, a worn tyre can break easily______ it’s mended, as is often the case.