瓦特第一阶段的蒸汽机改良解决了（）的问题。
A.操作复杂
B.造价高
C.维护成本高
D.效率低
参考答案：D
Jenny wants to the park.[ ]
A. go
B. to go
C. going
D. goes
用所给动词的适当形式填空
小题1:Millie is very glad ______ (meet) us here.
小题2:What about ___________(play) football on Sunday?
小题3:He ________(look) strong and plays tennis very well.
小题4:I want to go to the cinema. I’d like ____________(see) a film.
小题5:_______ she _______(speak) English well?
