1 The car's engine is beginning to act up.

2 to act up to one's principles,etc.

3 Her five - year - old daughter likes to act up before scores of visitors.

4 The kid likes to act up for the benefit of anyone who cares to notice.

5 Mr Ye tried to act up to his reputation.

6 The car's engine began to act up.

7 I to act up to that instruction.

8 I endeavored to act up to that instruction.

9 Watch Ricky. He sometimes likes to act up in class.

10 He like to act up and pretend that he is special.

11 We need to act up and stand for what we believe in.

12 When the girls tease him, he doesn to act up.

13 Watch Ricky, he sometimes likes to act up in class.

14 Watch Ricky. He at whiles likes to act up in class.

15 Jack always used to act up when his mother wouldn't let him watch TV.

16 Have you noticed around spring men start to act up a bit?

17 The young herdsman briskly mounted a horse that was inclined to act up with an unaccustomed rider.

18 The question was so unexpected that , for a moment , she was at a loss how to act up properly.

19 When the girls tease him,he doesn't quite know how to act up.

1 The car's engine is beginning to act up.

2 The young herdsman briskly mounted a horse that was inclined to act up with an unaccustomed rider.