一、单项选择。 1. John didn’t give up looking for a job ________ he got an offer from a German company. A. until B. since C. because 2. Children are not allowed ________ in the river. A.to swim B.swim C.Swimming 3. —________ Mr.Green was very tired,he stayed up late to finish his work. —How hard-working he is! A.If B.Unless C.Although 4. —Do you like your new neighbors? —No.The ________ between us are getting worse,I think. A.results B.invitations C.relations 5. Linda offered________ her seat to the old man on the bus. A.give B.gives C.to give 6. —Did you call her up last night? —No,I didn't.I wrote her a letter ________. A.instead B.yet C.Either 7. The librarian told me that I could ________ these magazines for three days. A.borrow B.buy C.keep 8. —I think students should spend time with friends doing their homework. —I ________. They would talk ________ doing homework. A.agree;instead of B.agree;without C.disagree;instead of 9. Jack competed ________ David for the monitor(班长) at the meeting yesterday. A.on B.with C.in 10. I ________ believe it ________ I see it with my own eyes. A.won't;and B.won't;until C.will;but