Out of the crowded bus______, who was dressed in a black suit and waved to a woman..

studyingchemistry for years, I can only say I have____general knowledge of thissubject.

t school, English is compulsory for all students, but French and Russian are _________.

No sooner _____ to sleep than the telephone rang oncemore.

The increase in the robbery rate made a number of residents at night. [ ]