______ water to grow is well known.
| A．That trees need |
| B．These trees need |
| C．That tree needs |
| D．Trees need |
. It’s high time that we ___ home and _____ supper now.
| A．go; have | B．went; had | C．go; should have | D．went to; have |
But for electricity, human life _____ so easy today.
| A．isn’t | B．would not be | C．will not be | D．would not have been |
We ___ to start our own business, but we never had enough money.
| A．have hoped | B．had hoped | C．would hope | D．should hope |
—We could have walked to the doctor’s; it was so near.
—Yes. A ride ___ at all necessary.
| A．wasn’t | B．hadn’t been | C．wouldn’t be | D．won’t be |
— Are you going to the ball tonight? —It’s too late now. How I wish ___ about it earlier.
| A．I’ll know | B．I’ve known | C．I know | D．I’d known |