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D. No matter who ① I39。ll have a meeting tomorrow has not been decided. A. That B. If C. Whether D. what ① Our teacher did ______ he could to help us. ② Our teacher did all______ he could to help us. A. what B. which C. that D. whom ① Father promised _____I studied harder he would take me to Beijing next summer. ② Father promised ____he would take me to Beijing next summer if I studied harder. A. that B. if C. that if D. if that ① _____ makes me feel sad seeing you living all alone. ② ______ makes me feel sad is seeing you living all alone. A. That B. This C. It D. What ① _____Japan lies east of China is known to all. ② I don39。ll be 3 years _____ he es back A. since B. that C. after D. before ① It won39。s at nine o39。 that D. that。 that B. that。s nine o39。ll succeed. ② Study hard, _____ you39。m not sure _____ he will finish the task on time. A. whether B. which C. if D. that ① ______he said at the meeting surprised us all. ② _____ he said nothing at the meeting surprised us all. A. What B. Which C. That D. Whether ① ______ we39。t know _____ he will e unless told. ② They don39。t e was that his mother was ill. ② It was ____ his mother was ill that he couldn39。re most needed. A. the place which B. where C. the place where D. which ① Is this bike _____ she lost the day before yesterday ② Is this the bike _____ she lost the day before yesterday A. that B. what C. the one D. it ① _____is well known, Hong Kong has been returned to our motherland. ② _____is well known that Hong Kong has been returned to our motherland. A. Which B. As C. It D. That ① We will never fet the days _______ we spent together. ② We will never fet the days_______we worked together. A. that B. where C. on which D. when ① Tom got the first place,______ made his parents happy. ② Tom got the first place, and _____ made his parents happy. A. as B. which C. that D. these