Despite the rising costs of many products, bus fares in the city of Zhuzhou ______ unchanged.
| A．remain | B．are remained | C．are remaining | D．remains |
Jane won’t join us for dinner tonight and _______.
| A．neither won’t Tom | B．Tom will too | C．Tom won’t either | D．so will Tom |
Many teenagers say that _____ they have a lot of friends, they really have no best friend.
| A．when | B．while | C．if | D．because |
As we know, penicillin became the greatest drug of the 20th century, ______ millions of lives.
| A．to save | B．saving | C．saved | D．Save |
—How long _______ in Shanghai?
—I will be there attending a conference and giving a speech, which will take about 3 days.
| A．have you stayed | B．are you staying | C．do you stay | D．did you stay |