It was not rare(稀少) in that people in fifties were going to school for further study.
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
—Would you like me to help you with the maths problem? —___________ It’s a most difficult one.
We were going out for a walk ________ it began to rain.
I want to buy that kind of cloth because I _____ the cloth _____ well.
Tomato, which used to be called “love-apple”, is not ____but ______.