.--What happened____you?—I was late for class this morning.
| A．at | B．on | C．to | D．with |
— ______ will I stay in Singapore during the summer holiday?
— Let me check it for you. For two days.
| A．How much | B．How long |
| C．How far | D．How many |
We’d better ______ subjects like age, weight or money while talking in Western countries.
| A．agree | B．avoid | C．afford | D．allow |
If ______ is a high-stress job, it is important that you learn how to relax after a busy day.
| A．you | B．your | C．yours | D．yourself |
Eric will never win a gold in the swimming race ______ he works hard.
| A．if | B．when | C．unless | D．since |
The solar-powered airplane Solar Impulse 2 arrived in Nanjing ______ April, 2015.
| A．in | B．on | C．at | D．to |