Two middle-aged passengers fell into the sea. ____, neither of them could swim.
A. In fact B. Luckily 
. Naturally D. Unfortunately
.
The fact _______ women can work as well as men is clear.
A. that B. which D. what D. whether
.
It’s none of your business ________ other people think about you. Believe yourself.
| A．how | B．what | C．which | D．when |
.
---May I smoke here?
--- If you ________, choose a seat near the window.
| A．should | B．could | C．may | D．must |
.
.--- How’s your tour around the North Lake? Is it beautiful?
--- It ________ be, but it is now heav
ily polluted (污染).
| A．will | B．would | C．should | D．must |
.
Einstein liked Bose’s paper so much that he ___ his own work and translated it into German.
| A．gave off | B．turned down | C．took over | D．set aside |