____， he never seems able to do the work beautifully.
| A．Try as he does | B．As he tries | C．Try as does he | D．As try he does |
Most people who enjoy travelling believe that travel ______ not only our bodies but also our minds.
| A．benefited | B．would benefit |
| C．has benefited | D．benefits |
Students show great interest in ______ Professor Edwards presents to them in his class.
| A．whichever | B．wherever |
| C．whatever | D．however |
—Are you going to the concert next week?
—I’d like to, but I ______ an exam then.
| A．take | B．took |
| C．was taking | D．will be taking |
—I didn’t know you play the piano. It sounds wonderful!
—Thank you! I ______ it when I worked in UK.
| A．learned | B．had learned |
| C．have learned | D．learn |
We are going to the theater tomorrow ______ all the tickets are sold out.
| A．when | B．unless |
| C．whether | D．because |