16. She used dried leaves and twigs to ____ up the hole.
A. over B. cover C. paint D.coat
17. I let you know as soon as I made my ______.
A. decide B. decided C. decisive D. decision
18. I found a picnic area down ____ the river.
A. beside B. besides C. outside D. inside
19. Lan lacks ______ skills because she never talks to her friends in class.
A. Communicating B. communication C. communicate D.communicative
20. Children always put their hands ____ the electrical socket.
A. onto B. into C. in D. to
16 B
17 D
18 A
19 D
20 B