I wonder why Jenny ______ us recently. We should have heard from her by now. [ ]

Hangzhou, which we visited last week is quite beautiful．—We should thank Tom．He ____ us to

.Three hours ______ enough forus to finish the task.

Maria often goes to the park ____ foot, she seldom goes there ____bus.

Why are you smoking so much these days–Sorry. I just can’t help .