—Did you look up the time of the trains to Shanghai?
—Yes, the early train is ________ to leave at 5:30 am.
| A．likely | B．possibly |
| C．possible | D．due |
24．You didn't believe John won the first prize at the speech competition, ______?
| A．did he | B．didn't he | C．did you | D．didn't you |
23．I had reached a point in my career _____ I needed to decide which way to go．
| A．why | B．which | C．when | D．Where |
22．Here are some new computer programs _____ for home buildings．
| A．designing | B．design | C．to design | D．Designed |
21．_______ sweet and fresh, this kind of food is so popular with local people and the tourists．
| A．Smell | B．Smelling | C．To smell | D．Smelt |
20．Always read the label ______ you wash your clothes．
| A．before | B．unless | C．since | D．Until |