By the year 2020 scientists _____ a lot of research on AIDS.
| A．had done | B．do | C．are doing | D．will have done |
--- I’m not good at singing, you know.
--- ________! It’s just for fun.
| A．No problem | B．Come on | C．What a pity | D．Cheer up |
— Please tell Bruce he has won the first prize in the speaking contest.
—________! He never did so well before.
| A．Congratulations | B．Good luck |
| C．That’s right | D．What a surprise |
Messiis famous ________ a football player and he is famous ________ his wonderful skills.
| A．for; as | B．with; for | C．as; for | D．like; as |
—I had been working till 4:00 a.m. to prepare a report for my boss.
—________ you look very tired.
| A．No doubt | B．No hurry | C．No wonder | D．No need |
Only when I left my parents ________ how much I loved them.
| A．I realized | B．I have realized | C．had I realized | D．did I realize |