"______ the friendship between our two people last forever!", and with this sincere hope, the president concluded his speech.

-- A medical team was sent to Japan by air five hours ago. ---So they_____ have arrived by now. The flight usually takes four hours or so.

You would have helped your mother do some housework. But you ____.

If you had told him the truth, he ______ so angry now．

It _________have rained last night, for the ground is wet.