If they ______, our plan will fall flat.a. are co-operating b. had not co-operated c. won’t co-operate d. didn’t co-operate
— But for your timely warning, we _____ into great trouble. — Well, you know we’re friends.
I would appreciate ______ you could give me some advice on TOFEL test.
________ doing his experiment, he forgot to pick up his wife from the station.
Only then did I realize that it was foolish to ___ my friends and never contact them.
After a day’s hard work, Mary went to the nearby shop to _____ herself to a strawberry ice cream.