He has worked the maths problem for nearly an hour but he simply can’t work it .On ;at B. on ;out C. at ;up D. for ;out
Progress so far has been very good . _______ ,we are sure that the project will be completed on time.
---How could you ______me so easily in the crowd ? --- Because you are so tall and handsome.
---Our family will go to Australia for a holiday. ---Oh, really? That sounds ________!
---“Why do you have to be there at six?” ---“The teacher demands that everyone _____in his seat at six.”
Some people waste a lot of food ____ others haven't enough to eat.