It was not a long time___we realized the truth
| A．when |
| B．until |
| C．since |
| D．before |
. — We had a good time in the park last Saterday. Pity you weren’t there.
— I really ____ come but I was looking after my mother in the hospital.
| A．must | B．ought to | C．need have | D．should have |
. Why not try your luck downtown? That’s ____ the best jobs are.
| A．where | B．what | C．when | D．why |
. _____ with letters and public phones, mobile phones and the Internet are faster and much more convenient.
| A．Compare | B．To compare | C．Comparing | D．Compared |
. The little boy is dirty from head to foot because he ___ in the mud all morning.
| A．had played | B．has played | C．was playing | D．is playing |
. — Put ____ waste bag in the dustbin.
—It’s not ____ waste bag. It’s my shopping bag.
| A．a; a | B．the; the | C．the; a | D．a; the |