______ has finished the work ahead of time will be rewarded though we don’t know______ it will be.
| A．Who; who | B．Whoever; whoever |
| C．Who; whoever | D．Whoever; who |
By August the flowers _____.
| A．die | B．will die | C．are to die | D．will have died |
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 |