单项选择1.There is a bird ____ in the tree.A.sing B.to sing C.si

单项选择
1.There is a bird ____ in the tree.
A.sing B.to sing C.singing D.sang
2.Funtawild Adventure is very popular and ____ tourists visit it year by year.
A.more and more B.fewer and fewer
C.less and less D.more or less
3.Ling Ling did ____ in the exam and made few mistakes.
A.careful enough B.enough careful
C.enough carefully D.carefullly enouth
4.We still have a long way ____ the animals in danger.
A.go to protect B.to go to protect