Out of the crowded bus _____, who was dressed in a black suit and waved to a woman. [ ]

It seems quite _____ to expect a student to master 3,000 words within only 5 days.

It was because of the bad weather __________ the football match had to be put off.(推迟)

It rained ______ and lasted for a long time yesterday.–Too bad! Even some streets were full of water.

The scientist was ______ in thoughts.[ ]