You should think twice … the answer.
A.before having given
B.before giving
C.giving
D.by giving

After … his homework, he played cards with his friends.
A.had done
B.having done
C.doing
D.did

He turned off all the lights before … home.
A.having gone
B.to go
C.going
D.went

She is looking forward … a party.
A.to having had
B.to have
C.having
D.to having

He objected … the working scheme.
A.to change
B.having changed
C.changing
D.to changing

Choose the best word/phrase to complete the sentences.
Everybody found the talk … Some students even fell asleep.
A.bore
B.boring
C.to bore
D.bored

Choose the best word/phrase to complete the sentences.
The old man … to the spot where the house used to stand.
A.glanced
B.showed
C.pointed
D.directed

Choose the best word/phrase to complete the sentences.
He must be the … I saw him steal her purse.
A.thief
B.hacker
C.murderer
D.robber

Choose the best word/phrase to complete the sentences.
He always complained … his mother about his work.
A.with
B.to
C.at
D.for

Choose the best word/phrase to complete the sentences.
You should … more attention to this new kind of exercise.
A.make
B.pay
C.focus
D.take