—This physics problem is too difficult. Can you show me _______, George?
—Sure.
| A．what to work out | B．to work it out | C．how to work it out | D．how to work out it |
He often practices English chatting with his pen pal in Australia.
| A．by | B．in | C．with | D．for |
---do you surf the Internet?
--- Once a week.
| A．How often | B．How long | C．How soon | D．How many |
He hardly ever feels tired, ______?
| A．is he | B．isn’t he | C．does he | D．doesn’t he |
Could you please give me______ on how to improve my English?
| A．a piece of advice |
| B．some piece of advice |
| C．some advice |
| D．an advice |
Don’t worry about , mum. I’m old enough to look after .
| A．I; me | B．me; mine | C．mine; me | D．me; myself |