Can I use the telephone on the table, sir? — Under no circumstances the telephone in the office for personal affairs.

The first painting Guilin Heights, which ______ several steep hills with the Li River _______ below, _______ over three meters tall.

Here is my classmate ________ bicycle was lost yesterday.

Theexplorer got a disease in blood for the _______ of fresh vegetables and fruit.

Earth is becoming more and more polluted. ______, people will move to Mars one day.