Although we’ve learned English for years, we have trouble _____ the foreigners.
| A．understand | B．to understand | C．understanding | D．of understanding |
Did she want see it again?
| A．to | B．/ | C．of | D．at |
It’s hot ____________summer in Beijing.
| A．by | B．on | C．at | D．in |
It’s a beautiful，sunny day! There ________ many people here on vacation.
| A．be | B．am | C．is | D．are |
Don’t be afraid of asking for information ______it is needed.
| A．when | B．after | C．although | D．unless |
There great changes in our city in the past 10 years.
| A．were | B．had | C．have been | D．have had |