Mr. Stevenson is great to work for-I really couldn’t ask for a ___ boss.
| A．better |
| B．good |
| C．best |
| D．still better |
I find _____ difficult for us to master English if we don’t work hard.
| A．that | B．it | C．this | D．what |
The father as well as his three children ______ skating on frozen river every Sunday afternoon in winter.
| A．is going | B．go | C．goes | D．are going |
Every possible means _______ been taken to prevent the river _________.
| A．have; polluting | B．has; polluted |
| C．has; from being polluted | D．have; being polluted |
I read little now and I am always busy with my job. ________ my friend.
| A．Either does | B．So is | C．So it is with | D．So does |
The supermarkets____open until late every evening, which provides us much convenience.
| A．prove | B．maintain | C．continue | D．remain |