You buy a gift, but you can if you want to.
| A．must | B．mustn't | C．have to | D．don't have to |
Rock- climbing is a breathtaking sport，courage plays an important role.
| A．which | B．whose | C．where | D．when |
Peter has treated himself to too much delicious food，his sharp increase in weight
| A．accounting for | B．appealing to | C．bringing in | D．allowing for |
Inspired by the seniors in college andhis own responsbilities，Dick is determined to work harder．
| A．to recognize | B．recognizing | C．recognized | D．being recognized |
Visitors from the mainland used toin Honghong for a flight toTaiwan.
| A．transfer | B．change | C．move | D．transport |
Tony is a lawyer now, but he in a delivery company for six years.
| A．has served | B．had served | C．was serving | D．served |