You've failed to do what you __________ to and I'm afraid the teacher will blame you.
--- How long _____ Professor White ______ the book ? ---- For about 10 days.
It is clear that a computer works ______ faster than an abacus .
Tommy is _______ captain of the class team at school and he is also _____ member of _____ Senor High team.
______ students up to 2, 000 , the school has built another laboratory.
Every possible means _______ to prevent the crash , but the computer doesn’t still work.