根据句意用所给动词的适当形式填空，必要时可加情态动词。
1．Peter ________（come）here tomorrow，but I'm not quite sure．
2．________people ________（use）money in 100 years?
3．--What were you doing when the UFO took oft?
--I ________（watch）．
4．Thank you so much for ________（invite）me．
5．You ________（have）your lunch already，haven't you?
6．I ________（not see）my aunt for a long time
7．If you work hard enough，you'll find a good way ________（learn）English better．
8．--Have you ever been to Qingdao?
--Yes．And I ________（stay）there for half a month．
9．--Who usually ________（wash）the dishes in your home?
--My mother does．
10．He asked whether I ________（be）interested in English．
1．may／might come 2．Will，use 3．was watching 4．inviting 5．have had 6．haven't seen 7．to learn 8．stayed 9．washes 10．was