(单选题)1: It was not until it got dark _______ working. A: that they stopped B: when they stopped C: did they stop D: that they didn’t stop ...

(单选题)21: Nowadays, middle-aged men, ________ often suffer from heart attack. A: in order B: in particular C: in addition D: in person ...

(单选题)35: The work______ be completed before this weekend. A: ought B: must C: had better to D: should to ...

(单选题)5: He doesn’t believe the worker can ____________ to assemble the motorcycle all by himself. A: succeed B: pursue C: manage D: handle ...

(单选题)39: Before ________ money in a new research, people should be aware of the prospective failures. A: use B: using C: invest D: investing ...

(单选题)33: Tom was busily ______ painting the furniture. A: engaged B: engaged in C: engaged to D: engaged with ...

(单选题)15: He soon received promotion, for his superiors realized that he was a man of considerable ____. A: ability B: future C: possibility D: opportunity ...

(单选题)3: ________ he discovered in his experiment is very important to us. A: That B: When C: What D: Where ...

(单选题)37: She once again went through her composition carefully to ____________ all spelling mistakes from it. A: withdraw B: abandon C: eliminate D: diminish ...

(单选题)31: Sometimes children have trouble fact from fiction and may believe that such things actually exist. A: of separating B: for separating C: separating D: to separate ...