The old pianist requested that he ____ the piano in the public again.
| A．play | B．played |
| C．would play | D．was going to play |
The boy _____ out to play until he had finished his homework.
| A．went | B．would go | C．doesn’t go | D．didn’t go |
Water _____ at 100 degrees centigrade.
| A．boiled | B．boils | C．has boiled | D．was boiling |
–English has large vocabulary, hasn’t it?
–Yes, _____ more words and expressions and you will find it easier to read and communicate.
| A．Know | B．Knowing | C．To know | D．Known |
The first use of atomic weapons was in 1945. and their power _____ increased enormously ever since.
| A．is | B．was | C．has been | D．had been |
I thought Jim would say something about his school report, but he _____ it.
| A．doesn’t mention | B．hadn’t mentioned |
| C．didn’t mention | D．hasn’t mentioned |