小题1:The girl looks beautiful in the ______(shine) red silk.

小题2:Jay sang the song________(beautiful).

小题3:The water in the river is_______(harm). You can drink it without cooking.

小题4:Can you tell me the ______(mean) of this word?

小题5:The Green family had a ______(delight) holiday last week.

试述左心衰竭的临床表现。