1.When we(see) them last night,they (sing);they(say)they(sing)since six o'clock.
2.We (wait) for you when you (get) back tomorrow.
3.They (not come) home until they(see) everything
4.What do you think the children(do)when we get home?
5.I'm sure the letter won't arrive in time unless it(send) by air.
6.He (work) hard all the week,but today he(have) a good time at home.
7.There(be) a lot of changes since computers(invent)
8.The house where the dead man(find) is being guarded by the police to prevent it from being entered.
9.This is only one of his poems that(be) worth reading
10.When I came to school,everybody(be)there.
II.
1.He/play/guitar/beautifully/Everything/seem/strange/here/us.
2.We/walk/happily/busy street/the noise/not bother/us/at all.
3.I/spend/photo of our hotel/. It/look/nice,doesn't it?
4.It/so quite/that we/can hardly/believe/it/Ho Chi Minh City.
5.Everyone/here/very nice/they/always/smile/happily.
6.We/hope/you/both well/. Please/give/love/to everyone/and write/soon.