In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
| A．species | B．group | C．amount | D．variety |
It’s not safe to travel by standing at the road side hoping to beby passing motorists.
| A．picked up | B．picked out | C．put on | D．taken on |
I earn only 50 dollars a week, she earns 80 dollars.
| A．when | B．while | C．as | D．since |
—Do I need to give a tip if I eat at a fast food restaurant in the United States?
—Yes , it’s a commonto tip waiters in a restaurant.
| A．sense | B．custom | C．method | D．practice |
There is argument on the spreading easy access to Internet.
| A．不填，the | B．an;the | C．the;an | D．the;不填 |
—Hey，you haven't been acting like yourself．Everything is OK?
—.
| A．Sure, it is | B．I'm fine，thanks | C．That's good | D．It's a pleasure |