I don’t know the word .I had to ____ a doctionary.A.look for B.make out C.refer to D.go over

I don’t know the word .I had to ____ a doctionary.A.look for B.make out C.refer to D.go over
第一题 I don’t know the word .I had to ____ a doctionary.
A.look for B.make out C.refer to D.go over
第二题 I have been to Beijing twice,but I still want to go there ___ time.
A.the third B.a third C.for the third D.for a third
第三题.If you hurry up,I think it quite ____ that you will catch the flight to * .There are 40 minutes left.
第四题Mary ___ politics in the university but now she is going into bussiness.
A.majores in B.majority C.major D.major in
都会做 但是讲不出理由 可以麻烦说详细点吗