All passengers ______ are expected to fasten the seat belts when the plane takes off and lands．
| A．on aboard | B．on board | C．on the board | D．on boards |
—Bob! How’s your project? I heard you started it last Friday，right?
—Oh！Ifor it．But I haven’t decided when to do it．
| A．have prepared | B．had prepared |
| C．have been preparing | D．was preparing |
a diary every day and you’ll improve your writing．
| A．Keeping | B．To keep | C．Keep | D．If you keep |
If we had taken such effective measures much earlier, the riverso seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
Thousands of Haitians cheered as the Chinese medical team arrived，many of even
cried with joy.
| A．those | B．them | C．whom | D．who |
—Our women athletes achieved great success in the Vancouver Olympic Winter Games．
—Yes. No one could perform , I think．
| A．well | B．better | C．best | D．the best |