1．If it ____________(snow) last night，it would be very cold today.
答案：had snowed
2．We ____________(invite) them to the dance, but they went abroad for their vacation.
答案：would have invited
3．She would never have behaved like that if she __________(have) some common sense.
答案：had
4．If he ____________(work) harder, he would succeed now.
答案：had worked
5．If I had a bike，I ____________(lend) it to you yesterday.
答案：would have lent
6．If you had not studied the problem carefully，you ____________(find) difficulty now.
答案：would find
