用括号内所给单词的正确形式填空。
1. This is one of _________(busy) underground
stations in London.
2. —And now, better _________(go) to hospital.
—All right.
3. Plenty of shops _________(be) open on Sunday mornings.
4. It’s only about an hour’s _________(
f
ly) from Qingdao to Beijing by air.
5. Ther
e will be a school _________(leaver) party next week.