We can say the number 77，645 in English is________．
| A．seventyseven thousand and six hundred and fortyfive |
| B．seventyseven thousand six hundred and fortyfive |
| C．seventyseven thousand six hundred fortyfive |
| D．seventy seven thousand six hundred and fortyfive |
The safety of food has become one of the _________ problems in our daily life.
| A．more expensive | B．more important |
| C．most expensive | D．most important |
We are supposed to ___________a solution to stop people from looking down at their mobile phones while driving cars.
| A．come up with | B．come from |
| C．come out | D．come true |
The left-behind kids(留守儿童)can’t see their parents_________ the parents come back home from work.
| A．but | B．until | C．or | D．if |
---- Excuse me, could you please tell me ________?
---- Yes, there is a history museum.
| A．how often do you go to the history museum |
| B．are there any good museums in Kunming. |
| C．how long it takes to get to the history museum |
| D．if there are any good museums in Kunming. |
Teenagers should be encouraged to go ______and be close to nature.
| A．inside | B．back | C．outside | D．off |