(2013·四川，5)—Why are your eyes so red？You________have slept well last night.—Yeah，I stayed up late writing a report.

The picture is ______ at least twenty pounds.

My parents live in a small village. They always keep candles in the house _____ the electricity is cut off.

The difficult problems make him __________

The teacher together with the students _____discussing Reading Skills that ______newly published in America.