154. Using renewable energy is a simple idea, but ______ we find it hard to put into practice.
| A．one | B．what | C．which | D．That |
—Why was he unhappy yesterday?
—A letter from home ______ an attack of homesickness.
| A．set off | B．set out | C．set about | D．set up |
______great progress Jim had made in _______ time!
| A．What a ; such a short | B．What ; so short a |
| C．How a ; such a short | D．How; such short |
When I wanted to buy a computer, I saved as much as I could, and my motherthe rest of the money.
| A．kept up | B．held up | C．tool up | D．made up |
---I hear Mary is in hospital
---Oh, really? Iknow, I go to visit him.
| A．didn’t, will | B．didn’t, am going to | C．don’t, would | D．don’t, will |
It was not until I started my own career that I realizedprecious time I had wasted before.
| A．so | B．how | C．what | D．that |