---______ can we warn people not to swim here?---By putting up signs.A. How B. Why C. Where
________ plastic bags we use, ________ it will be to the environment.
The little boy was made _____ again after his mother told him some jokes.
-_____ beautiful flowers! Who sent them to you? --Ah, it’s a secret.
-The flight to London wasbecause of the heavy snow.
-Little Tomhome for three days. His parents are very worried.