A survey of health researchers ______ that four hours of exercise every week ____ good for our health.
| A．show; are | B．shows; is |
| C．show; is | D．shows; are |
Close the door of fear behind you, and youthe door of faith open before you.
| A． | saw | B． | have seen | C． | will see | D． | are seeing |
Bicycling is good exercise; _______, it does not pollute the air.
| A．nevertheless | B．besides | C．otherwise | D．therefore |
Time,correctly, is money in the bank.
| A． | to use | B． | used | C． | using | D． | use |
Don’t worry. The hard work that you do now ______later in life.
| A．will be repaid | B．was being repaid |
| C．has been repaid | D．was repaid |
We’ve had a good start, but next, more work needs _____to achieve the final success.
| A．being done | B．do | C．to be done | D．to do |