—Would you like me to help you with the maths problem?—___________ It’s a most difficult one.
We were swimming in the lake _____ suddenly the storm started.
---Have you read the timetable ? ---Yes . The train ____ at 10:12 p.m..
Do you know __________ ?
The message is very important, so it is supposed _______ as soon as possible.
Visiting _______ Great Wall is ________ unforgettable experience to me.