Even with the guide leading the way，they_______to cross the thick forest.

86 The river is too deep; we can’t _______it

11The public has complained that large quantities of waste water ______ into rivers without being cleaned, so large amounts of money ______ to solve the problem

l must have lost his job in thatunemployment crisis, he—I don’t think so Yesterday I saw himworking together with his colleagues

While the alien ________ the museum, the boy called the TV station.