完成句子。
________(在很多情况下)，this kind of matter is hard to deal with．
I hadn't waited long ________ she came．
Someone called me up in the middle of the night, but they hung up ________ I could answer the phone．
辨析：join; join in; attend; take part in; go in for; enter for; be present at
1)Our headmaster will ________ us ________ the discussion this afternoon．
2)They had a quiet wedding－only a few friends ________(it)．
3)We'll ________ social activities during the summer vacation．
4)Jack has ________ the long jump, but I don't think he has a chance to win．
5)A lot of people ________ the medical conference in London last month．
用join的适当形式填空。
________ the union/club/army/police, etc
Membership is free, so ________ today!
用sure＆certain的适当形式填空。
She will not come here for ________ reason．
I am ________ that he will win the race．
It is ________ that the earth is round．
Mary will be here ________(确定地)in half an hour．