John, you ____ the computer game for two hours. It’s bad for your eyes. Stop, please!—OK, Mum.

Mike has much difficulty ________ Chinese so he often asks me ________ help.

Do you have enough students to carry the boxes?—No, I think we needstudents.

The 30th Olympic Games will be held in London ________ 2012. [ ]

This is____ a difficult problem ____ all of us can’t work it out.