---- I am not able to solve some practical problems using Newton’s First Law of Motion.
----That’s just _______ most of the students are puzzled easily.
| A．what | B．why | C．how | D．where |
Why do you insist on buying a car ______ you have such good public transportation here?
| A．because | B．unless | C．when | D．though |
The owner still doesn’t know _______ broke into the house and stole the money.
| A．when it was that | B．who it was that | C．who was it that | D．when was it that |
The scientists have made an exhaustive study of the virus _______ many people have been inflected.
| A．to which | B．in which | C．with which | D．for which |
When I was in Spain last summer, I ______ quite a lot of Spanish.
| A．made up | B．picked up | C．gave up | D．took up |
It comes as no surprise that many parents walk along their young children ____ their safety.
| A．in search of | B．in place of | C．for fear of | D．for lack of |