根据句意、汉语提示或首字母和英文释义写出单词的正确形式。（15分）
小题1:They enjoyed ______________(他们自己) in the park..
小题2:When I met her, I realized that I had ____________ (忘记) my book at home.
小题3:I feel bad that I didn't ______________(提供)any food to them.
小题4:An old friend of _____________(她的) came to see her yesterday, She was unexpected.
小题5:Spitting in public places is bad _____________(举止).
小题6:I had already ___________(建议) him not to do like this, but he didn’t listen to me .
小题7:I feel ____________ (骄傲的) to be a part of the team.
小题8:The truck was traveling at a _____________(速度) of 50 mph.
小题9:He has two p__________ to be operated on.
小题10:She lives by herself and often feels l___________.
小题11:The teacher told us that light______________(travel) much faster than sound.
小题12:It’s necessary for us _________________(do) some exercise before the final exam.
小题13:We _______________ (run) outside when you called us at this time yesterday.
小题14:---Why not ________(buy) a toy car for your son? ---Good idea. He must like it very much.
小题15:Linda spends as much time as she can _______________(practise) reading English.