He fell asleep immediately last night; he must ________ (be) very tired.
和平赎买的具体方式 ___________。
1949年中华人民共和国的建立， 标志着中国从半殖民地半封建社会进入 _________。
The TV station, in ________ to massive popular demand, decided to continue the soap opera(肥皂剧 ).
I have been studying here for four years, by next summer I ________.
