There is______ “u” and ______“r” in the word “umbrella”.
| A．a, a | B．a, an | C．an, a | D．an, an |
The math problem is so hard, I really don’t know _____.
| A．how to do it | B．how to do |
| C．what to do it | D．when to do |
--- Shall we call a taxi?
---- Ok, Let me ______ the phone number in Yellow Pages.
| A．look at | B．look for |
| C．look up | D．look after |
_____ there may be sharks near the beach, people still swim there.
| A．Since | B．But | C．As | D．Although |
The school isn’t far ________ my home. It’s just ten minutes’ walk.
| A．out | B．off | C．at | D．from |
Wherever he meets a new word, he will _____ in his English dictionary.
| A．look at it | B．look it up |
| C．look through it | D．look it down |