We didn’t know you were in trouble at that time, ________we would have given you a hand.
| A．while | B．when | C．therefore | D．otherwise |
I think you should complain — ____,of course, you are happy with the way things are.
| A．if | B．unless | C．as | D．because |
－How do you usually find out about new software?
－In the magazines like Popular Electronics. That’s computer companies usually advertise.
| A．which | B．where | C．what | D．why |
______the address, Tom sent the email to his teacher.
| A．Having checked | B．Checked | C．Being checked | D．To check |
They all wanted to stop working because they were tired, but ___of them would say sl.
| A．any | B．some | C．none | D．neither |
________Hard you may try, you can’t possibly persuade Tom to give up smoking, for he is so addicted to it.
| A．Whatever | B．However | C．Whichever | D．Whenever |