____________myself to my study，I would be sitting in a comfortable office now.
| A．If I devoted | B．Should I devote |
| C．Would I devote | D．Had I devoted |
．—______ I lock the lab before I go home?
—Don’t bother．I’ll check it myself later．
| A．May | B．Must | C．Can | D．Shall |
．Interestingly in some parts of the world, women are expected to earn money _____ men work at home and raise their children．
| A．but | B．though | C．because | D．while |
Leaders of many countries have been trying to _____ what it is that makes China develop so fast in recent years．
| A．carry out | B．figure out | C．watch out | D．make out |
I’m not sure whether I will have anything else to do this evening．_____, I will try every possible means to come to your birthday party．
| A．Even though | B．If so | C．Anyhow | D．Instead |
My toothache is killing me．I _____ it _____ away．But now it’s getting worse and worse．
| A．think; is going | B．thought; was going |
| C．have thought; is going | D．had thought; had gone |